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Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2019 shares
Document and Entity Information
Document Type	20-F
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	21VIANET GROUP, INC.
Entity Central Index Key	0001508475
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Class A Ordinary Shares
Document and Entity Information
Entity Common Stock, Shares Outstanding	505,253,850
Class B Ordinary Shares
Document and Entity Information
Entity Common Stock, Shares Outstanding	174,649,638
Class C Ordinary Shares
Document and Entity Information
Entity Common Stock, Shares Outstanding	60,000

CONSOLIDATED BALANCE SHEETS ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Current assets:
Cash and cash equivalents	$ 259,772	¥ 1,808,483	¥ 2,358,556
Restricted cash	68,786	478,873	265,214
Accounts and notes receivable (net of allowance for doubtful debt of RMB70,970 and RMB67,828 (US$9,743) as of December 31, 2018 and 2019, respectively)	94,395	657,158	524,305
Short-term investments	52,265	363,856	245,014
Prepaid expenses and other current assets	232,433	1,618,149	1,159,574
Amounts due from related parties	43,331	301,665	125,446
Total current assets	750,982	5,228,184	4,678,109
Non-current assets:
Property and equipment, net	781,919	5,443,565	4,031,242
Intangible assets, net	58,978	410,595	355,313
Land use rights, net	33,490	233,154	147,493
Operating lease right-of-use assets, net	175,474	1,221,616
Goodwill	142,137	989,530	989,530
Restricted cash	10,029	69,821	37,251
Deferred tax assets	30,074	209,366	159,441
Long-term investments	24,369	169,653	544,323
Amounts due from related parties	2,967	20,654	34,424
Other non-current assets	39,870	277,568	173,591
Total non-current assets	1,299,307	9,045,522	6,472,608
Total assets	2,050,289	14,273,706	11,150,717
Current liabilities:
Short-term bank borrowings (including short-term bank borrowings of the Consolidated VIEs without recourse to the primary beneficiaries of RMB50,000 and RMB232,323 (US$33,371) as of December 31, 2018 and 2019, respectively)	33,684	234,500	50,000
Accounts and notes payable (including accounts and notes payable of the Consolidated VIEs without recourse to the primary beneficiaries of RMB258,048 and RMB211,710 (US$30,410) as of December 31, 2018 and 2019, respectively))	43,542	303,128	389,508
Accrued expenses and other payables (including accrued expenses and other payables of the Consolidated VIEs without recourse to the primary beneficiaries of RMB392,619 and RMB622,160 (US$89,368) as of December 31, 2018 and 2019, respectively)	140,613	978,935	659,320
Advances from customers (including advances from customers of the Consolidated VIEs without recourse to the primary beneficiaries of RMB670,037 and RMB1,068,692 (US$153,508) as of December 31, 2018 and 2019, respectively)	153,508	1,068,692	670,037
Deferred revenue (including deferred revenue of the Consolidated VIEs without recourse to the primary beneficiaries of RMB51,026 and RMB52,088 (US$7,482) as of December 31, 2018 and 2019, respectively)	8,277	57,625	57,754
Income taxes payable (including income taxes payable of the Consolidated VIEs without recourse to the primary beneficiaries of RMB8,519 and RMB8,175 (US$1,174) as of December 31, 2018 and 2019, respectively)	6,899	48,032	13,111
Amounts due to related parties (including amounts due to related parties of the Consolidated VIEs without recourse to the primary beneficiaries of RMB51,763 and RMB56,977 (US$8,184) as of December 31, 2018 and 2019, respectively)	23,979	166,935	52,328
Current portion of long-term bank borrowings (including current portion of long-term bank borrowings of the Consolidated VIEs without recourse to the primary beneficiaries of RMB75,284 and RMB32,500 (US$4,668) as of December 31, 2018 and 2019, respectively)	4,668	32,500	75,284
Current portion of finance lease liabilities (including current portion of finance lease liabilities of the Consolidated VIEs without recourse to the primary beneficiaries of RMB219,695 and RMB220,363 (US$31,653) as of December 31, 2018 and 2019, respectively)	32,623	227,115	219,695
Deferred government grants (including deferred government grants of the Consolidated VIEs without recourse to the primary beneficiaries of RMB4,173 and RMB2,595 (US$373) as of December 31, 2018 and 2019, respectively)	373	2,595	4,173
Current portion of bonds payable	130,878	911,147
Current portion of operating lease liabilities (including current portion of operating lease liabilities of the Consolidated VIEs without recourse to the primary beneficiaries of nil and RMB410,422 (US$58,953) as of December 31, 2018 and 2019, respectively)	62,888	437,817
Total current liabilities	641,932	4,469,021	2,191,210
Non-current liabilities:
Long-term bank borrowings (including long-term bank borrowings of the Consolidated VIEs without recourse to the primary beneficiaries of RMB112,000 and RMB79,500 (US$11,419) as of December 31, 2018 and 2019, respectively)	11,419	79,500	112,000
Bonds payable	296,002	2,060,708	2,037,836
Non-current portion of finance lease liabilities (including non-current portion of finance lease liabilities of the Consolidated VIEs without recourse to the primary beneficiaries of RMB852,287 and RMB549,669 (US$78,955) as of December 31, 2018 and 2019, respectively)	128,836	896,927	765,993
Unrecognized tax benefits (including unrecognized tax benefits of the Consolidated VIEs without recourse to the primary beneficiaries of RMB4,938 and RMB1,991 (US$286) as of December 31, 2018 and 2019, respectively)	351	2,443	6,677
Deferred tax liabilities (including deferred tax liabilities of the Consolidated VIEs without recourse to the primary beneficiaries of RMB84,568 and RMB82,725 (US$11,883) as of December 31, 2018 and 2019, respectively)	29,098	202,572	157,720
Deferred government grants (including deferred government grants of the Consolidated VIEs without recourse to the primary beneficiaries of RMB11,619 and RMB5,906 (US$848) as of December 31, 2018 and 2019, respectively)	848	5,906	11,619
Amounts due to related parties (including amounts due to related parties of the Consolidated VIEs without resource to the primary beneficiaries of RMB504,478 and RMB745,899 (US$107,142) as of December 31, 2018 and 2019, respectively)	107,142	745,899	504,478
Non-current portion of operating lease liabilities (including non-current portion of operating lease liabilities of the Consolidated VIEs without resource to the primary beneficiaries of nil and RMB529,546 (US$76,064) as of December 31, 2018 and 2019, respectively)	83,183	579,102
Total non-current liabilities	656,879	4,573,057	3,596,323
Total liabilities	1,298,811	9,042,078	5,787,533
Commitments and contingencies
Shareholders' equity:
Additional paid-in capital	1,321,866	9,202,567	9,141,494
Accumulated other comprehensive income	11,190	77,904	85,979
Statutory reserves	8,687	60,469	42,403
Accumulated deficit	(580,078)	(4,038,390)	(3,838,032)
Treasury stock	(50,206)	(349,523)	(337,683)
Total 21Vianet Group, Inc. shareholders' equity	711,466	4,953,073	5,094,207
Noncontrolling interest	40,012	278,555	268,977
Total shareholders' equity	751,478	5,231,628	5,363,184
Total liabilities and shareholders' equity	2,050,289	14,273,706	11,150,717
Class A Ordinary Shares
Shareholders' equity:
Ordinary shares	5	34	34
Class B Ordinary Shares
Shareholders' equity:
Ordinary shares	$ 2	¥ 12	¥ 12

CONSOLIDATED BALANCE SHEETS (Parenthetical) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 CNY (¥) shares
Accounts and notes receivable, allowance for doubtful accounts	$ 9,743	¥ 67,828	¥ 70,970
Short-term bank and other borrowings of the Consolidated VIEs without recourse to the primary beneficiaries	33,684	234,500	50,000
Accounts and notes payable of the Consolidated VIEs without recourse to the primary beneficiaries	43,542	303,128	389,508
Accrued expenses and other payables of the Consolidated VIEs without recourse to the primary beneficiaries	140,613	978,935	659,320
Advance from customers of the Consolidated VIEs without recourse to the primary beneficiaries	153,508	1,068,692	670,037
Deferred revenue of the Consolidated VIEs without recourse to the primary beneficiaries	8,277	57,625	57,754
Income tax payables of the Consolidated VIEs without recourse to the primary beneficiaries	6,899	48,032	13,111
Amounts due to related parties of the consolidated VIEs without resource to the primary beneficiaries	23,979	166,935	52,328
Long-term bank borrowings, current portion	4,668	32,500	75,284
Current portion of finance lease liabilities of the Consolidated VIEs without recourse to the primary beneficiaries.	32,623	227,115	219,695
Deferred government grants of the Consolidated VIEs without recourse to the primary beneficiaries	373	2,595	4,173
Long-term bank borrowings of the Consolidated VIEs without recourse to the primary beneficiaries	11,419	79,500	112,000
Bonds payable Consolidated VIEs without recourse to the primary beneficiaries.	296,002	2,060,708	2,037,836
Non-current portion of finance lease liabilities	128,836	896,927	765,993
Unrecognized tax benefits of the Consolidated VIEs without recourse to the primary beneficiaries	351	2,443	6,677
Deferred tax liabilities of the Consolidated VIEs without recourse to the primary beneficiaries	29,098	202,572	157,720
Deferred government grants of the Consolidated VIEs without recourse to the primary beneficiaries	848	5,906	11,619
Amounts due to related parties related parties of the consolidated VIEs without resource to the primary beneficiaries	107,142	745,899	504,478
Current portion of operating lease liabilities	62,888	437,817
Non-current portion of operating lease liabilities	83,183	579,102
Variable Interest Entity, Primary Beneficiary
Short-term bank and other borrowings of the Consolidated VIEs without recourse to the primary beneficiaries	33,371	232,323	50,000
Accounts and notes payable of the Consolidated VIEs without recourse to the primary beneficiaries	30,410	211,710	258,048
Accrued expenses and other payables of the Consolidated VIEs without recourse to the primary beneficiaries	89,368	622,160	392,619
Advance from customers of the Consolidated VIEs without recourse to the primary beneficiaries	153,508	1,068,692	670,037
Deferred revenue of the Consolidated VIEs without recourse to the primary beneficiaries	7,482	52,088	51,026
Income tax payables of the Consolidated VIEs without recourse to the primary beneficiaries	1,174	8,175	8,519
Amounts due to related parties of the consolidated VIEs without resource to the primary beneficiaries	8,184	56,977	51,763
Long-term bank borrowings, current portion	4,668	32,500	75,284
Current portion of finance lease liabilities of the Consolidated VIEs without recourse to the primary beneficiaries.	31,653	220,363	219,695
Deferred government grants of the Consolidated VIEs without recourse to the primary beneficiaries	373	2,595	4,173
Long-term bank borrowings of the Consolidated VIEs without recourse to the primary beneficiaries	11,419	79,500	112,000
Non-current portion of finance lease liabilities	78,955	549,669	852,287
Unrecognized tax benefits of the Consolidated VIEs without recourse to the primary beneficiaries	286	1,991	4,938
Deferred tax liabilities of the Consolidated VIEs without recourse to the primary beneficiaries	11,883	82,725	84,568
Deferred government grants of the Consolidated VIEs without recourse to the primary beneficiaries	848	5,906	11,619
Amounts due to related parties related parties of the consolidated VIEs without resource to the primary beneficiaries	107,142	745,899	504,478
Current portion of operating lease liabilities	58,953	410,422	0
Non-current portion of operating lease liabilities	$ 76,064	¥ 529,546	¥ 0
Class A Ordinary Shares
Ordinary shares, par value (in dollars per share) \| $ / shares	$ 0.00001
Ordinary shares, shares authorized (in shares)	1,200,000,000	1,200,000,000	1,200,000,000
Ordinary shares, shares issued (in shares)	505,253,850	505,253,850	499,706,628
Ordinary shares, shares outstanding (in shares)	505,253,850	505,253,850	499,706,628
Class B Ordinary Shares
Ordinary shares, par value (in dollars per share) \| $ / shares	$ 0.00001
Ordinary shares, shares authorized (in shares)	300,000,000	300,000,000	300,000,000
Ordinary shares, shares issued (in shares)	174,649,638	174,649,638	174,649,638
Ordinary shares, shares outstanding (in shares)	174,649,638	174,649,638	174,649,638
Class C Ordinary Shares
Ordinary shares, par value (in dollars per share) \| $ / shares	$ 0.00001
Ordinary shares, shares authorized (in shares)	60,000	60,000	0
Ordinary shares, shares issued (in shares)	60,000	60,000	0
Ordinary shares, shares outstanding (in shares)	60,000	60,000	0

CONSOLIDATED STATEMENTS OF OPERATIONS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares
Net revenues
Total net revenues	$ 544,251	¥ 3,788,967	¥ 3,401,037	¥ 3,392,705
Total cost of revenues	(409,308)	(2,849,518)	(2,456,166)	(2,634,295)
Gross profit	134,943	939,449	944,871	758,410
Operating income (expenses)
Operating income	986	6,862	5,027	5,439
Sales and marketing expenses	(29,634)	(206,309)	(172,176)	(256,682)
Research and development expenses	(12,754)	(88,792)	(92,109)	(149,143)
General and administrative expenses	(59,651)	(415,277)	(462,637)	(519,950)
(Allowance) reversal for doubtful debt	(224)	(1,557)	598	(37,427)
Impairment of receivables from equity investees	(7,490)	(52,142)
Changes in the fair value of contingent purchase consideration payables			13,905	(937)
Impairment of long-lived assets		0	0	(401,808)
Impairment of goodwill				(766,440)
Total operating expenses	(108,767)	(757,215)	(707,392)	(2,126,948)
Operating (loss) profit	26,176	182,234	237,479	(1,368,538)
Interest income	7,844	54,607	45,186	32,925
Interest expense	(49,693)	(345,955)	(236,066)	(185,313)
Impairment of long-term investment				(20,258)
Gain on disposal of subsidiaries			4,843	497,036
Loss on debt extinguishment	(2,714)	(18,895)
Other income	5,226	36,380	58,033	16,764
Other expenses	(809)	(5,632)	(4,103)	(17,060)
Foreign exchange loss, net	(4,021)	(27,995)	(81,055)	(17,153)
(Loss) income before income taxes and gain (loss) from equity method investments	(17,991)	(125,256)	24,317	(1,061,597)
Income tax benefits (expenses)	(781)	(5,437)	(24,411)	90,170
Gain (loss) from equity method investments	(7,261)	(50,553)	(186,642)	53,783
Net loss	(26,033)	(181,246)	(186,736)	(917,644)
Net loss (income) attributable to noncontrolling interest and redeemable noncontrolling interest	(150)	(1,046)	(18,329)	144,914
Net loss attributable to the Company's ordinary shareholders	$ (26,183)	¥ (182,292)	¥ (205,065)	¥ (772,730)
Loss per share:
Basic (in per share) \| (per share)	$ (0.04)	¥ (0.27)	¥ (0.30)	¥ (1.36)
Diluted (in per share) \| (per share)	$ (0.04)	¥ (0.27)	¥ (0.30)	¥ (1.36)
Shares used in loss per share computation:
Weighted average number of shares outstanding - basic (in shares) \| shares	668,833,756	668,833,756	674,732,130	672,836,226
Weighted-average number of shares outstanding-diluted (in shares) \| shares	668,833,756	668,833,756	674,732,130	672,836,226
Hosting and related services
Net revenues
Total net revenues	$ 544,251	¥ 3,788,967	¥ 3,401,037	¥ 2,975,178
Total cost of revenues	(409,308)	¥ (2,849,518)	¥ (2,456,166)	(2,130,279)
Operating income (expenses)
Impairment of goodwill \| $	$ 0
Managed Network Services
Net revenues
Total net revenues				417,527
Total cost of revenues				¥ (504,016)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (26,033)	¥ (181,246)	¥ (186,736)	¥ (917,644)
Other comprehensive (loss) income, net of tax of nil:
Other comprehensive (loss) income, net of tax of nil	(1,160)	(8,075)	88,652	(120,963)
Comprehensive loss	(27,193)	(189,321)	(98,084)	(1,038,607)
Comprehensive loss (income) attributable to noncontrolling interest and redeemable noncontrolling interest	(150)	(1,046)	(18,329)	144,914
Comprehensive loss attributable to the Company's ordinary shareholders	$ (27,343)	¥ (190,367)	¥ (116,413)	¥ (893,693)

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Foreign currency translation adjustments, tax	¥ 0	¥ 0	¥ 0
Other comprehensive income, tax	¥ 0	¥ 0	¥ 0

CONSOLIDATED STATEMENTS OF CASH FLOWS ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (26,033)	¥ (181,246)	¥ (186,736)	¥ (917,644)
Adjustments to reconcile net loss to net cash generated from operating activities:
Foreign exchange loss, net	4,021	27,995	81,055	17,153
Changes in the fair value of contingent purchase consideration payables			(13,905)	937
Gain from settlement of contingent purchase consideration			(500)
Depreciation and amortization	110,920	772,205	634,606	667,102
(Gain) loss on disposal of property and equipment and intangible assets	39	271	(7,981)	(3,285)
Impairment of receivables from equity investees	7,490	52,142
Allowance (reversal) for doubtful debt	224	1,557	(598)	37,427
Share based compensation expense	6,308	43,916	59,538	47,129
Deferred income tax benefits	(9,320)	(64,887)	(19,776)	(128,026)
(Gain) loss from equity method investments	7,261	50,553	186,642	(53,783)
Distribution received from an equity method investment	2,902	20,200
Gain from disposal of equity investments without readily determinable fair value	(795)	(5,536)	(20,496)
Gain from disposal of equity method investment	(2,564)	(17,853)	(16,509)
Dividend income of equity investments without readily determinable fair values			(406)	(1,821)
Gain from disposal of subsidiaries			(4,843)	(497,036)
Impairment losses of long-lived assets		0	0	401,808
Impairment of goodwill				766,440
Impairment of long-term investment				20,258
Loss on debt extinguishment	2,714	18,895
Changes in operating assets and liabilities, net of effects of acquisitions and disposals:
Accounts and notes receivable	(22,427)	(156,134)	(68,809)	18,277
Prepaid expenses and other current assets	(47,148)	(328,224)	(262,445)	(311,324)
Amounts due from related parties	1,631	11,352	(38,047)	4,436
Accounts and notes payables	1,319	9,185	41,380	42,468
Unrecognized tax benefits	(608)	(4,234)	(9,834)	(3,939)
Accrued expenses and other payables	11,098	77,275	77,744	270,082
Deferred revenue	(19)	(129)	2,001	(65,415)
Advances from customers	57,263	398,655	266,793	201,847
Income taxes payable	5,016	34,917	(198)	(6,548)
Deferred government grants	72	500	(6,643)	(4,985)
Amounts due to related parties	868	6,044	12,933	(14,356)
Operating lease right-of-use assets	5,100	35,503
Net cash generated from operating activities	115,332	802,922	704,966	487,202
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(179,384)	(1,248,834)	(435,220)	(395,998)
Purchases of land use rights	(3,513)	(24,460)
Purchases of intangible assets	(3,809)	(26,515)	(17,874)	(18,957)
Proceeds from disposal of property and equipment	357	2,484	15,429	5,719
Disposal of subsidiaries, net			3,389	(77,719)
Payments for short-term investments	(62,733)	(436,737)	(98,905)	(755,876)
Payment of loan to a third party			(20,000)
Payment of loans to related parties	(9,581)	(66,704)
Receipt of loans to third parties			20,413	100,000
Proceeds received from maturity of short-term investments	44,844	312,198	417,643	484,932
Proceeds from disposal of long-term investments	2,722	18,955	75,653
Proceeds from dividend income of equity investments without readily determinable fair values			406	1,821
Payments for long-term investments	(1,340)	(9,330)	(252,780)	(162,176)
Payments for deposit to acquire data center	(11,857)	(82,536)	(13,000)
Collection of deposit for acquiring data center	4,308	30,000
Receipt of deposit for disposal of subsidiaries				10,000
Payments for assets acquisition, net of cash acquired	(21,269)	(148,067)		(25,053)
Cash receipt from an assets acquisition	9,705	67,563
Net cash used in investing activities	(231,550)	(1,611,983)	(304,846)	(833,307)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from loan from a related party			44,038
Repayment of loan from a related party	(6,879)	(47,893)
Proceeds from exercise of stock options	62	429	435	926
Proceeds from issuance of ordinary shares	82	572
Repayment of 2017 Notes				(420,600)
Proceeds from issuance of 2020/2021 Notes (Note 16)	289,018	2,012,084		1,936,154
Payment of issuance cost of 2020/2021 Notes (Note 16)	(5,115)	(35,610)		(9,735)
Repurchase of 2020 Notes (Note 16)	(164,913)	(1,148,092)
Proceeds from long-term bank borrowings				44,440
Proceeds from short-term bank borrowings	33,685	234,500	69,999	70,000
Repayment of long-term bank borrowings	(12,224)	(85,110)	(70,643)	(94,037)
Repayment of short-term bank borrowings	(7,182)	(50,000)	(69,999)	(1,673,676)
Payments for purchase of property and equipment through finance leases	(47,921)	(333,614)	(279,886)	(199,126)
Repayment of loan from a third party	(9,719)	(67,659)		(100,000)
Rental prepayment and deposits for sales and leaseback transactions	(2,786)	(19,399)	(48,401)	(164,698)
Contribution from noncontrolling interest in subsidiaries	1,226	8,532	196,281	134,633
Prepayment for future share repurchase plan	(1,405)	(9,778)		(3,866)
Refund of prepayment for share repurchase plan			42,710
Payments for share repurchase plan	(1,701)	(11,840)		(133,066)
Proceeds from sales and leaseback transactions	15,801	110,000
Proceeds from discounted notes			95,565
Repayment of notes payable	(13,727)	(95,565)
Net cash (used in) generated from financing activities	66,302	461,557	(19,901)	(612,651)
Effect of foreign exchange rate changes on cash and cash equivalents and restricted cash	6,271	43,660	85,333	(140,298)
Net (decrease) increase in cash and cash equivalents and restricted cash	(43,645)	(303,844)	465,552	(1,099,054)
Cash and cash equivalents and restricted cash at beginning of the year	382,232	2,661,021	2,195,469	3,294,523
Cash and cash equivalents and restricted cash at end of the year	338,587	2,357,177	2,661,021	2,195,469
Reconciliation of cash and cash equivalents and restricted cash to the consolidated balance sheets
Cash and cash equivalents	259,772	1,808,483	2,358,556	1,949,631
Restricted cash-current	68,786	478,873	265,214	242,494
Restricted cash-non-current	10,029	69,821	37,251	3,344
Cash and cash equivalents and restricted cash at end of the year	338,587	2,357,177	2,661,021	2,195,469
Supplemental disclosures of cash flow information:
Income taxes paid	(5,988)	(41,684)	(57,407)	(55,076)
Interest paid	(31,011)	(215,889)	(160,984)	(96,846)
Interest received	8,483	59,054	50,793	28,857
Supplemental disclosures of non-cash activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	88,788	618,126
Purchase of property and equipment through finance leases	51,362	357,573	884,871	453,786
Purchase of property and equipment included in accrued expenses and other payables	49,448	344,248	21,918	(15,750)
Purchase of intangible assets included in accrued expenses and other payables	$ (236)	¥ (1,642)	870	1,354
Contingent consideration related to the acquisitions included in amounts due to related parties and accrued expenses and other payables			¥ 36,734	¥ (937)

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY ¥ in Thousands	Ordinary shares USD ($) shares	Ordinary shares CNY (¥) shares	Treasury stock USD ($)	Treasury stock CNY (¥)	Additional paid-in capital USD ($)	Additional paid-in capital CNY (¥)	Accumulated other comprehensive (loss) income USD ($)	Accumulated other comprehensive (loss) income CNY (¥)	Statutory reserves USD ($)	Statutory reserves CNY (¥)	Accumulated deficit USD ($)	Accumulated deficit CNY (¥)	Total 21Vianet Group, Inc. shareholders' equity USD ($)	Total 21Vianet Group, Inc. shareholders' equity CNY (¥)	Non-controlling interest USD ($)	Non-controlling interest CNY (¥)	USD ($) shares	CNY (¥) shares
Beginning Balance (in shares) at Dec. 31, 2016 \| shares	679,857,606	679,857,606
Beginning balance at Dec. 31, 2016		¥ 45		¥ (204,557)		¥ 9,015,846		¥ 118,290		¥ 64,622		¥ (2,869,031)		¥ 6,125,215		¥ 25,802		¥ 6,151,017
Consolidated net loss												(772,730)		(772,730)		(3,018)		(775,748)
Cumulative adjustment for changes in accounting principles												(13,425)		(13,425)				(13,425)
Contribution from noncontrolling interest in a subsidiary																134,633		134,633
Foreign exchange difference								(120,963)						(120,963)				(120,963)
Issuance of new shares for share option exercised and restricted share units vested (in shares) \| shares	3,119,052	3,119,052
Share-based compensation						105,532								105,532				¥ 105,532
Share issued to depository bank		¥ 1				(1)
Shares issued to depository bank (in shares) \| shares	9,000,000	9,000,000															9,000,000	9,000,000
Appropriation of statutory reserves										2,083		(2,083)
Appropriation of dividend																(5,946)		¥ (5,946)
Disposal of subsidiaries										(27,969)		27,969
Increase in accretion of redeemable noncontrolling interests						(141,896)								(141,896)				(141,896)
Share repurchase				(133,126)										(133,126)				¥ (133,126)
Share repurchase (in shares) \| shares	(20,690,892)	(20,690,892)															(3,448,482)	(3,448,482)
Share options exercised						926								926				¥ 926
Share options exercised (in shares) \| shares	332,754	332,754
Restricted share units vested(shares) \| shares	10,576,398	10,576,398
Settlement of share options with shares held by depository bank		¥ 0		0		0		0		0		0		0		0		0
Settlement of share options with shares held by depository bank (in shares) \| shares	(10,909,152)	(10,909,152)
Ending Balance (in shares) at Dec. 31, 2017 \| shares	671,285,766	671,285,766
Ending balance at Dec. 31, 2017		¥ 46		(337,683)		8,980,407		(2,673)		38,736		(3,629,300)		5,049,533		151,471		5,201,004
Consolidated net loss												(205,065)		(205,065)		18,329		(186,736)
Foreign exchange difference						477		88,652						89,129				89,129
Issuance of new shares for share option exercised and restricted share units vested (in shares) \| shares	3,070,500	3,070,500
Share-based compensation						67,009								67,009				67,009
Disposal of 49% interest in a subsidiary						93,166								93,166		103,115		¥ 196,281
Shares issued to depository bank (in shares) \| shares																	0	0
Appropriation of statutory reserves										3,667		(3,667)
Disposal of subsidiaries																(3,938)		¥ (3,938)
Share repurchase (in shares) \| shares																	0	0
Share options exercised						435								435				¥ 435
Share options exercised (in shares) \| shares	219,972	219,972
Restricted share units vested		¥ 0		0		0		0		0		0		0		0		0
Restricted share units vested(shares) \| shares	5,115,558	5,115,558
Settlement of share options with shares held by depository bank		¥ 0		0		0		0		0		0		0		0		0
Settlement of share options with shares held by depository bank (in shares) \| shares	(5,335,530)	(5,335,530)
Ending Balance (in shares) at Dec. 31, 2018 \| shares	674,356,266	674,356,266
Ending balance at Dec. 31, 2018		¥ 46		(337,683)		9,141,494		85,979		42,403		(3,838,032)		5,094,207		268,977		5,363,184
Consolidated net loss												(182,292)		(182,292)		1,046		(181,246)
Contribution by noncontrolling interest																8,532		8,532
Foreign exchange difference						24		(8,075)						(8,051)				(8,051)
Issuance of new shares	$ 60,000					572								572				572
Issuance of new shares for share option exercised and restricted share units vested (in shares) \| shares	304,200	304,200
Share-based compensation						60,048								60,048				¥ 60,048
Shares issued to depository bank (in shares) \| shares	6,700,002	6,700,002															6,700,002	6,700,002
Appropriation of statutory reserves										18,066		(18,066)
Share repurchase				(11,840)										(11,840)				¥ (11,840)
Share repurchase (in shares) \| shares	(1,456,980)	(1,456,980)															(242,830)	(242,830)
Share options exercised		¥ 0		0		429		0		0		0		429		0		¥ 429
Share options exercised (in shares) \| shares	33,869	33,869
Restricted share units vested		¥ 0		0		0		0		0		0		0		0		0
Restricted share units vested(shares) \| shares	5,136,306	5,136,306
Settlement of share options with shares held by depository bank		¥ 0		0		0		0		0		0		0		0		0
Settlement of share options with shares held by depository bank (in shares) \| shares	(5,170,175)	(5,170,175)
Ending Balance (in shares) at Dec. 31, 2019 \| shares	679,963,488	679,963,488
Ending balance at Dec. 31, 2019	$ 7,000	¥ 46	$ (50,206,000)	¥ (349,523)	$ 1,321,866,000	¥ 9,202,567	$ 11,190,000	¥ 77,904	$ 8,687,000	¥ 60,469	$ (580,078,000)	¥ (4,038,390)	$ 711,466,000	¥ 4,953,073	$ 40,012,000	¥ 278,555	$ 751,478,000	¥ 5,231,628

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)	Dec. 31, 2018	Mar. 31, 2017
Warburg Pincus
Noncontrolling interest, ownership percentage	49.00%	49.00%

ORGANIZATION

12 Months Ended

Dec. 31, 2019

ORGANIZATION

ORGANIZATION

1. ORGANIZATION

21Vianet Group, Inc. was incorporated under the laws of the Cayman Islands on October 16, 2009 and its principal activity is investment holding. The Company through its consolidated subsidiaries and variable interest entities (the “VIEs”) are principally engaged in the provision of hosting and related services after the disposal of subsidiaries which are engaged in managed network services in September 2017 (Note 4).

(a)

As of December 31, 2019, the significant subsidiaries of the Company and consolidated variable interest entities are as follows:

Entity	Date of incorporation/ acquisition	Place of incorporation	Percentage of direct ownership by the Company		Principal activities
			Direct
Subsidiaries:
21ViaNet Group Limited (“21Vianet HK”)	May 25, 2007	Hong Kong	100	%	Investment holding
21Vianet Data Center Co., Ltd. (“21Vianet China”) (1)	June 12, 2000	PRC	100	%	Provision of technical and consultation services and rental of long-lived assets
21Vianet (Foshan) Technology Co.,Ltd. (“FS Technology”) (1)	December 20, 2011	PRC	100	%	Trading of network equipment, provision of technical and internet data center services
21Vianet Anhui Suzhou Technology Co.,Ltd. (“SZ Technology”) (1)	November 16, 2011	PRC	100	%	Trading of network equipment
21Vianet Hangzhou Information Technology Co., Ltd. (“HZ Technology”) (1)	March 4, 2013	PRC	100	%	Provision of internet data center services
21Vianet Mobile Limited (“21V Mobile”)	April 30, 2013	Hong Kong	100	%	Investment holding and provision of telecommunication services
Joytone Infotech Co., Ltd. (“SZ Zhuoaiyi”) (1)	April 30, 2013	PRC	100	%	Provision of technical and consultation services
21Vianet Ventures Limited ("Ventures")	March 6, 2014	Hong Kong	100	%	Investment holding
Abitcool (China) Broadband Inc. (“aBitCool DG”) (1)	June 13, 2014	PRC	100	%	Dormant company
Diyixian.com Limited (“DYX”)	August 10, 2014	Hong Kong	100	%	Provision of virtual private network services
21Vianet Zhuhai Financial Leasing Co., Ltd. (“Zhuhai Financial Leasing”) (1)	April 9, 2015	PRC	100	%	Provision of finance leasing business services
21Vianet DRP Investment Holdings Limited (“DRP investment”)	January 10, 2017	Hong Kong	100	%	Investment holding

Entity	Date of incorporation/ acquisition	Place of incorporation	Percentage of direct ownership by the Company		Principal activities
			Direct
Shihua DC Investment Holdings Limited (“Shihua Investment”)	March 14, 2017	Cayman Islands	51	%	Investment holding
21Vianet (Xi’an) Technology Co., Ltd. (“Xi’an Tech”) (1)	July 5, 2012	PRC	51	%	Provision of technical and internet data center services
Foshan Zhuoyi Intelligence Data Co., Ltd. (“FS Zhuoyi”) (1)	July 7, 2017	PRC	51	%	Provision of internet data center services
Beijing Hongyuan Network Technology Co., Ltd. ("BJ Hongyuan") (1)	December 8, 2014	PRC	51	%	Provision of internet data center services
Dermot Holdings Limited (“Dermot BVI”) (3)	August 8, 2014	British Virgin Islands	100	%	Investment holding
Shihua DC Investment Holdings 2 Limited(“Shihua Holdings 2”) (4)	August 20, 2019	Cayman Islands	100	%	Investment holding
Shanghai Waigaoqiao Free Trade Zone Hongming Logistics Co., Ltd. (“Hongming Logistics”) (1)/(4)	August 20, 2019	PRC	100	%	Provision of internet data center services

Variable Interest Entities (the “VIEs”):
Beijing Yiyun Network Technology Co., Ltd. (“21Vianet Technology”) (1) /(2)	October 22, 2002	PRC	—		Provision of internet data center services
Beijing iJoy Information Technology Co., Ltd. (“BJ iJoy”) (1) / (2)	April 30, 2013	PRC	—		Provision of internet data center, content delivery network services
WiFire Network Technology (Beijing) Co., Ltd. (“WiFire Network”) (1) / (2)	April 1, 2014	PRC	—		Provision of telecommunication services

Held directly by 21Vianet Technology:
Beijing 21Vianet Broad Band Data Center Co., Ltd. (“21Vianet Beijing”) (1) / (2)	March 15, 2006	PRC	—		Provision of internet data center services

Held directly by 21Vianet Beijing:
21Vianet (Xi’an) Information Outsourcing Industry Park Services Co., Ltd. (“Xi’an Sub”) (1) / (2)	June 23, 2008	PRC	—		Provision of internet data center services
Langfang Xunchi Computer Data Processing Co., Ltd. (“LF Xunchi”) (1) / (2)	December 19, 2011	PRC	—		Dormant company
Shanghai Blue Cloud Technology Co., Ltd. (“SH Blue Cloud”) (1) / (2)	March 21, 2013	PRC	—		Provision of Office 365 and Windows Azure platform services
Beijing Yichengtaihe Investment Co., Ltd. (“BJ Yichengtaihe”) (1)/ (2)	September 30, 2014	PRC	—		Provision of internet data center services

Entity	Date of incorporation/ acquisition	Place of incorporation	Percentage of direct ownership by the Company		Principal activities
			Direct
Guangzhou Lianyun Big Data Co. Ltd.(1)/(2)	April 14, 2016	PRC	—		Provision of internet data center services
Beijing Xianghu Yunlian Technology Co., Ltd. (“Xianghu Yunlian”)(1)/(2)	November 7, 2018	PRC	—		Provision of internet data center services
Shanghai Hujiang Songlian Technology Co., Ltd.(“Hujiang Songlian”)(1)/(2)	December 17, 2018	PRC	—		Provision of internet data center services
Beijing Shuhai Hulian Technology Co., Ltd. (“BJ Shuhai”)(1)/(2)	January 2, 2019	PRC	—		Provision of internet data center services
Nantong Chenghong Cloud Computing Co., Ltd. (“NT Chenghong”) (1)/(2)	December 19, 2019	PRC	—		Provision of internet data center services

Held directly by DYX and LF Xunchi:
Shenzhen Diyixian Telecommunication Co., Ltd. (“SZ DYX”) (1)	August 10, 2014	PRC	100	%	Provision of virtual private network services

(1)

Collectively, the “PRC Subsidiaries”.

(2)

Collectively, the “Consolidated VIEs”.

(3)

On August 10, 2014, the Company and its subsidiary, LF Xunchi, acquired 100% equity interest of Dermot BVI and its subsidiaries (collectively referred to as “Dermot Entities”).

(4)

On August 20, 2019, the Company through its subsidiary, DRP Investment, became the sole shareholder in Shihua Holding 2 and its subsidiaries (Note 4).

(b)

PRC laws and regulations prohibit foreign ownership of internet and telecommunications-related businesses. To comply with these foreign ownership restrictions, the Company conducts its businesses in the PRC through its VIEs using contractual agreements (the “VIE Agreements”). The equity interests of 21Vianet Technology are legally held by certain PRC individuals, including Chen Sheng, the Executive Chairman of Board of Directors of the Company and Zhang Jun (collectively the “Nominee Shareholders”). The following is a summary of the key terms of the VIE Agreements:

Exclusive option agreement

Pursuant to the exclusive option agreement entered into amongst 21Vianet China and the Nominee Shareholders of 21Vianet Technology, the Nominee Shareholders granted the Company or its designated party, an exclusive irrevocable option to purchase all or part of the equity interests held by the Nominee Shareholders in 21Vianet Technology, when and to the extent permitted under the PRC laws, at an amount equal to RMB1. 21Vianet Technology cannot declare any profit distributions or grant loans in any form without the prior written consent of 21Vianet China. The Nominee Shareholders must remit in full any funds received from 21Vianet Technology to 21Vianet China, in the event any distributions are made by 21Vianet Technology. The term of this agreement is 10 years, expiring on December 18, 2016, which is renewable at the sole discretion of 21Vianet China. On December 19, 2016, this agreement was renewed for another 10 years, expiring on December 18, 2026.

Exclusive technical consulting and service agreement

Pursuant to the exclusive technical consulting and service agreement entered into between 21Vianet China and 21Vianet Technology, 21Vianet China is to provide exclusive management consulting services and internet technical services in return for fees based on of a predetermined hourly rate of RMB1, which is adjustable at the sole discretion of 21Vianet China. The term of this agreement is 10 years, expiring on December 18, 2016, which is renewable at the sole discretion of 21Vianet China. On December 19, 2016, this agreement was renewed for another 10 years, expiring on December 18, 2026.

Loan agreement

In January 2011, 21Vianet China and the Nominee Shareholders entered into a loan agreement. Pursuant to the agreement, 21Vianet China has provided interest-free loan facilities of RMB7,000 and RMB3,000, respectively, to the Nominee Shareholders of 21Vianet Technology for the purpose of providing capital to 21Vianet Technology to develop its data center and telecommunications value-added business and related businesses. There is no fixed term for the loan.

Power of attorney agreement

The Nominee Shareholders entered into the power of attorney agreement whereby they granted an irrevocable proxy of the voting rights underlying their respective equity interests in 21Vianet Technology to 21Vianet China, which includes, but are not limited to, all the shareholders’ rights and voting rights empowered to the Nominee Shareholders by the company law and 21Vianet Technology’s Articles of Association. The power of attorney remains valid and irrevocable from the date of execution, so long as each Nominee Shareholder remains as a shareholder of 21Vianet Technology.

The power of attorney agreement was subsequently reassigned to 21Vianet Group, Inc. in September 2010.

Share pledge agreement

Pursuant to the share pledge agreement entered into amongst 21Vianet China, 21Vianet Technology and the Nominee Shareholders, the Nominee Shareholders have contemporaneously pledged all their equity interests in 21Vianet Technology to guarantee the repayment of the loan under the Loan Agreement between 21Vianet China and the Nominee Shareholders.

On August 10, 2015, a Notification of Cancellation of share pledge registration was issued by Beijing Administration for Industry and Commerce, Pinggu Branch to cancel the registration of the share pledge by one of the Nominee Shareholders, Zhang Jun. Such cancellation does not affect the effectiveness of the share pledge agreement and does not lessen the control imposed on the contractual parties of the Company.

If 21Vianet Technology breaches its respective contractual obligations under the Share pledge agreement and the loan agreement, 21Vianet China, as pledgee, will be entitled to certain rights, including the right to sell the pledged equity interests. The Nominee Shareholders agreed not to transfer, sell, pledge, dispose of or otherwise create any new encumbrance on their equity interests in 21Vianet Technology without the prior written consent of 21Vianet China.

Financial support letter

Pursuant to the financial support letter, 21Vianet Group, Inc. agreed to provide unlimited financial support to 21Vianet Technology for its operations and agreed to forego the right to seek repayment in the event 21Vianet Technology is unable to repay such funding.

The Company also controls two other VIEs, namely BJ iJoy and WiFire Network through their primary beneficiary, aBitCool DG and SZ Zhuoaiyi, wholly owned subsidiaries of the Company. The key terms of the VIE Agreements in relation to BJ iJoy and WiFire Network are similar to those summarized above.

Despite the lack of technical majority ownership, there exists a parent-subsidiary relationship between the Company and 21Vianet Technology through the irrevocable power of attorney agreement, whereby the Nominee Shareholders effectively assigned all of their voting rights underlying their equity interests in 21Vianet Technology to the Company. In addition, the Company, through 21Vianet China, obtained effective control over 21Vianet Technology through the ability to exercise all the rights of 21Vianet Technology’s shareholders pursuant to the share pledge agreement and exclusive option agreement. The Company demonstrates its ability and intention to continue to exercise the ability to absorb substantially all of the expected losses through the financial support letter. In addition, the Company also demonstrates its ability to receive substantially all of the economic benefits of 21Vianet Technology through 21Vianet China through the consulting and service agreement. Thus, the Company is the primary beneficiary of 21Vianet Technology and consolidates 21Vianet Technology and its subsidiaries under Accounting Standards Codification (“ASC”) Subtopic 810‑10, Consolidation: Overall (“ASC 810‑10”). Similar conclusion has been reached with respect to the VIE structures with aBitCool DG and SZ Zhuoaiyi as the primary beneficiary.

In the opinion of the Company’s management and PRC counsel, (i) the ownership structure of the VIEs is in compliance with applicable PRC laws and regulations in any material respect, and (ii) each of the VIE Agreements is valid, legally binding and enforceable to each party of such agreements under the existing PRC laws and will not violate any PRC laws or regulations currently in effect.

However, there are substantial uncertainties regarding the interpretation and application of current and future PRC laws and regulations. Accordingly, the Company cannot be assured that PRC regulatory authorities will not ultimately take a contrary view to its opinion. If the current ownership structure of the Company and its contractual arrangements with the VIEs are found to be in violation of any existing or future PRC laws and regulations, the Company may be required to restructure its ownership structure and operations in the PRC to comply with the changing and new PRC laws and regulations. To the extent that changes and new PRC laws and regulations prohibit the Company’s VIE arrangements from complying with the principles of consolidation, the Company would have to deconsolidate the financial position and results of operations of its VIEs. In the opinion of management, the likelihood of loss in respect of the Company’s current ownership structure or the contractual arrangements with the VIEs is remote based on current facts and circumstances.

(c)

VIE disclosures

Except for certain property with carrying amounts of RMB219,736 (US$31,564) that were pledged to secure banking borrowings granted to the Company (Note 13), there were no pledges or collateralization of the Consolidated VIEs’ assets. Creditors of the Consolidated VIEs have no recourse to the general credit of the primary beneficiaries of the Consolidated VIEs, and such amounts have been parenthetically presented on the face of the consolidated balance sheets. The Consolidated VIEs operate the data centers and own facilities including data center buildings, leasehold improvements, fiber optic cables, computers and network equipment, which are recognized in the Company’s consolidated financial statements. They also hold certain value-added technology licenses, registered copyrights, trademarks and registered domain names, including the official website, which are also considered as revenue-producing assets. However, none of such assets was recorded on the Company’s consolidated balance sheets as such assets were all acquired or internally developed with insignificant cost and expensed as incurred. In addition, the Company also hires data center operation and marketing workforce for its daily operations and such costs are expensed when incurred. The Company has not provided any financial or other support that it was not previously contractually required to provide to the Consolidated VIEs during the periods presented.

(d)

Cooperation with Waburg Pincus

In March 2017, the Company entered into an investment agreement with Warburg Pincus to establish a multi-stage joint venture and build a digital real estate platform in China. The Company seeded the initial JV with four existing high-performing IDC assets, and Warburg Pincus contributed direct capital and extensive industry network and resources in the real estate sector. The Company owns 51% of the equity interests in the four existing internet data center (“IDC”) assets while Warburg Pincus owns the remaining 49%. On March 14, 2017, Shihua Investment was established by the Company and a subsidiary of Warburg Pincus, with the equity interest of 51% and 49%, respectively.

In March 2017, the Company and Warburg Pincus set up two joint ventures, Shihua Holdings 2 and Shihua DC Investment Management Limited (“Shihua Investment Management”) (collectively, “Shihua DC Holdings”) (Note 12), with the equity interest of 49% and 51%, respectively. The Company accounted for the investment in the two joint ventures under equity method investments for its ability to exercise significant influence.

In July 2019, the Company entered into restructuring agreements with Warburg Pincus. Pursuant to the restructuring agreement, Shihua Holdings 2 transferred 100% of the equity interest in some subsidiaries at the consideration equivalent to the subsidiaries’ paid-in capital to Warburg Pincus. Thereafter, Shihua Holdings 2 repurchased and cancelled all Warburg Pincus’s shares in Shihua Holdings 2. Upon completion of restructuring on August 20, 2019, the Company became the sole shareholder in Shihua Holdings 2, which was accounted for as an asset acquisition (Note 4).

The following tables represent the financial information of the Consolidated VIEs as of December 31, 2018 and 2019 and for the years ended December 31, 2017, 2018 and 2019 before eliminating the intercompany balances and transactions between the Consolidated VIEs and other entities within the Company:


	As of December 31,
	2018	2019
	RMB	RMB	US$
ASSETS
Current assets:
Cash and cash equivalents	548,921	591,503	84,964
Restricted cash	203,103	260,961	37,485
Accounts receivable (net of allowance for doubtful debt of RMB69,723 and RMB66,416 (US$9,540) as of December 31, 2018 and 2019, respectively)	375,515	513,440	73,751
Short-term investments	94,000	—	—
Prepaid expenses and other current assets	1,013,563	1,371,564	197,013
Amounts due from related parties	123,726	57,982	8,328
Total current assets	2,358,828	2,795,450	401,541
Non-current assets:
Property and equipment, net	3,103,995	3,580,341	514,284
Intangible assets, net	47,121	151,722	21,794
Land use rights, net	60,078	58,588	8,416
Operating lease right-of-use assets, net	—	1,144,846	164,447
Goodwill	302,647	302,647	43,473
Restricted cash	33,729	66,119	9,497
Deferred tax assets	156,412	180,959	25,993
Amounts due from related parties	13,514	20,654	2,967
Other non-current assets	162,392	262,685	37,732
Long-term investments	219,005	189,571	27,230
Total non-current assets	4,098,893	5,958,132	855,833
Total assets	6,457,721	8,753,582	1,257,374
Current liabilities:
Short-term bank borrowings	50,000	232,323	33,371
Accounts and notes payable	258,048	211,710	30,410
Accrued expenses and other payables	392,619	622,160	89,368
Advance from customers	670,037	1,068,692	153,508
Deferred revenue	51,026	52,088	7,482
Income tax payable	8,519	8,175	1,174
Amounts due to inter-companies (1)	2,117,097	2,786,838	400,304
Amounts due to related parties	51,763	56,977	8,184
Current portion of finance lease liabilities	219,695	220,363	31,653
Current portion of long-term bank borrowings	75,284	32,500	4,668
Deferred government grants	4,173	2,595	373
Current portion of operating lease liabilities	—	410,422	58,953
Total current liabilities	3,898,261	5,704,843	819,448


	As of December 31,
	2018	2019
	RMB	RMB	US$
Non-current liabilities:
Amounts due to inter-companies (1)	1,020,972	1,020,972	146,653
Amounts due to related parties	504,478	745,899	107,142
Long-term bank borrowings	112,000	79,500	11,419
Non-current portion of finance lease liabilities	852,287	549,669	78,955
Unrecognized tax benefits	4,938	1,991	286
Deferred tax liabilities	84,568	82,725	11,883
Deferred government grants	11,619	5,906	848
Non-current portion of operating lease liabilities	—	529,546	76,064
Total non-current liabilities	2,590,862	3,016,208	433,250
Total liabilities	6,489,123	8,721,051	1,252,698


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net revenues	2,578,893	2,532,854	2,858,176	410,551
Net (loss) profit	(567,395)	52,986	111,592	16,029


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net cash generated from operating activities	448,051	693,620	495,308	71,147
Net cash (used in) generated from investing activities	(604,507)	132,522	(1,247,764)	(179,230)
Net cash generated from (used in) financing activities	230,921	(423,467)	885,286	127,163
Net increase in cash and cash equivalents and restricted cash	74,465	402,705	132,830	19,080

(1)

Amounts due to inter-companies consist of intercompany payables to the other companies within the Company for the purchase of telecommunication resources and property and equipment on behalf of the Consolidated VIEs.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2019

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

(a) Basis of presentation

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).

(b) Principles of consolidation

The consolidated financial statements include the financial statements of the Company, its subsidiaries and the Consolidated VIEs for which the Company or a subsidiary of the Company is the primary beneficiary. All significant inter-company transactions and balances between the Company, its subsidiaries and the Consolidated VIEs are eliminated upon consolidation. Results of acquired subsidiaries and its Consolidated VIEs are consolidated from the date on which control is transferred to the Company.

The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Significant estimates and assumptions reflected in the Company’s financial statements include, but are not limited to, estimating the useful lives of long-lived assets, determining the fair value of equity investments, accounting for investments and the subsequent impairment assessment, determining the provision for accounts and other receivables, determining the valuation allowance for deferred tax assets, accounting for share-based compensation arrangements, goodwill and long-lived assets impairment assessment, measurement of right-of-use assets and lease liabilities and determining the standalone lease price. Changes in facts and circumstances may result in revised estimates. Actual results could differ from those estimates, and as such, differences may be material to the consolidated financial statements.

(d) Foreign currency

The functional currency of the Company and its overseas subsidiaries is the United States dollar (“US$”), whereas the functional currency of the Company’s PRC subsidiaries and its Consolidated VIEs is the Chinese Renminbi (“RMB”) as determined based on the criteria of ASC Topic 830, Foreign Currency Matters (“ASC 830”). The Company uses the RMB as its reporting currency.

The financial statements of the Company and its overseas subsidiaries are translated from the functional currency to the reporting currency, RMB. Transactions denominated in foreign currencies are re-measured into the functional currency at the exchange rates prevailing on the transaction dates. Monetary assets and liabilities denominated in foreign currencies are re-measured at the exchange rates prevailing at the balance sheet date. Non-monetary items that are measured in terms of historical costs in foreign currency are re-measured using the exchange rates at the dates of the initial transactions. Exchange gains and losses are included in the consolidated statements of operations.

The Company uses the average exchange rate for the year and the exchange rate at the balance sheet date to translate the operating results and financial position, respectively. Translation differences are recorded in accumulated other comprehensive income (loss) within the statements of comprehensive loss.

(e) Convenience translation

Amounts in US$ are presented for the convenience of the reader and are translated at the noon buying rate of US$1.00 to RMB6.9618 on December 31, 2019, the last business day in fiscal year 2019, representing the noon buying rate set forth in the H.10 statistical release of the U.S. Federal Reserve Board. No representation is made that the RMB amounts could have been, or could be converted, realized or settled into US$ at such rate or at any other rate.

(f) Cash and cash equivalents

Cash and cash equivalents consist of cash on hand and demand deposits placed with banks which are unrestricted as to withdrawal and use and have original maturities less than three months. All highly liquid investments with a stated maturity of 90 days or less from the date of purchase are classified as cash equivalents.

(g) Restricted cash

Restricted cash mainly represents amounts held by a few banks in escrow as security for credit facilities, the guarantee of compliance with the network and service requirements of the radio spectrum license awarded by the Hong Kong Telecommunication Authority, the deposits for finance lease, the deposits for a lawsuit with a third party, the deposits held in escrow for the advances received from end customers subscribing Office 365 and Windows Azure services (the disbursement of which shall be agreed by both Microsoft (China) Co., Ltd. (“Microsoft”) and the Company), the deposits for business operation.

The Company adopted ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, effective January 1, 2018 using the retrospective transition method and included all restricted cash with cash and cash equivalent when reconciling beginning-of-period and end-of-period total amounts presented in the consolidated statements of cash flows.

(h) Short-term investments

All highly liquid investments with original maturities of greater than three months but less than twelve months, are classified as short-term investments. Interest income is included in earnings.

(i) Accounts receivable and allowance for doubtful debt

Accounts receivable are carried at net realizable value. An allowance for doubtful debt is recorded in the period when loss is probable based on an assessment of specific evidence indicating troubled collection, historical experience, accounts aging and other factors. An accounts receivable is written off after all collection effort has ceased.

(j) Property and equipment

Property and equipment are stated at cost less accumulated depreciation and any recorded impairment. Property and equipment acquired in a business combination are recognized initially at fair value at the data of acquisition. Property and equipment are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:


Category		Estimated useful life
Property		25-46 years
Leasehold improvements		Over the shorter of lease term or the estimated useful lives of the assets
Optical fibers		10-20 years
Computer and network equipment		1-10 years
Office equipment		2-8 years
Motor vehicles		2-8 years

Repair and maintenance costs are charged to expense as incurred, whereas the costs of betterments that extend the useful life of property and equipment are capitalized as additions to the related assets. Retirements, sale and disposals of assets are recorded by removing the cost and accumulated depreciation with any resulting gain or loss reflected in the consolidated statements of operations.

Property and equipment that are purchased or constructed which require a period of time before the assets are ready for their intended use are accounted for as construction-in-progress. Construction-in-progress is recorded at acquisition cost, including installation costs. Construction-in-progress is transferred to specific property and equipment accounts and commences depreciation when these assets are ready for their intended use.

(k) Intangible assets

Intangible assets are carried at cost less accumulated amortization and any recorded impairment. Intangible assets acquired in a business combination are recognized initially at fair value at the date of acquisition. Intangible assets with finite useful lives are amortized using a straight-line method. These amortization methods reflect the estimated pattern in which the economic benefits of the respective intangible assets are to be consumed.

The Company has capitalized certain internal use software development costs in accordance with ASC Subtopic 350‑40, Intangibles-Goodwill and Other: Internal-Use Software (“ASC 350‑40”), amounting to RMB9,238, RMB6,093, and RMB13,189 (US$1,894) for the years ended December 31, 2017, 2018 and 2019, respectively. The Company capitalizes certain costs relating to software acquired, developed, or modified solely to meet the Company’s internal requirements and for which there are no substantive plans to market the software. These costs mainly include the research staff costs directly associated with the internal-develop software projects during the application development stage. Capitalized internal-use software costs are included in “intangible assets, net”.

Intangible assets have weighted average useful lives from the date of purchase/ acquisition as follows:


Purchased software		5.1 years
Radio spectrum license		15 years
Operating permits*		31.9 years
Contract backlog*		4.9 years
Customer relationships*		8.8 years
Licenses*		15 years
Supplier relationships*		10 years
Trade Names*		20 years
Platform software*		5 years
Non-complete agreements*		5 years
Internal use software		4 years

*Acquired in the acquisitions of subsidiaries.

(l) Leases

Effective January 1, 2019, the Company adopted ASC Topic 842, Lease ("ASC 842") using the modified retrospective method and did not restate the comparable periods. The Company determines if an arrangement is a lease at inception. Leases are classified as operating or finance leases in accordance with the recognition criteria in ASC 842-20-25. The Company's leases do not contain any material residual value guarantees or material restrictive covenants.

The Company has elected the package of practical expedients, which allows the Company not to reassess (1) whether any expired or existing contracts as of the adoption date are or contain a lease, (2) lease classification for any expired or existing leases as of the adoption date and (3) initial direct costs for any expired or existing leases as of the adoption date. The Company has lease agreements with lease and non lease components, which are generally accounted for separately. Lastly, the Company elected the short-term lease exemption for all contracts with lease term of 12 months or less.

At the commencement date of a lease, the Company determines the classification of the lease based on the relevant factors present and records a right-of-use ("ROU") asset and lease liability for operating lease, and records property and equipment and finance lease liability for finance lease. ROU assets and property and equipment acquired through lease represent the right to use an underlying asset for the lease term, and operating lease liabilities and finance lease liabilities represent the obligation to make lease payments arising from the lease. ROU assets and lease liabilities are calculated as the present value of the lease payments not yet paid. If the rate implicit in the Company's leases is not readily available, the Company uses an incremental borrowing rate based on the information available at the lease commencement date in determining the present value of lease payments. This incremental borrowing rate reflects the fixed rate at which the Company could borrow on a collateralized basis the amount of the lease payments in the same currency, for a similar term, in a similar economic environment. ROU assets include any lease prepayments and are reduced by lease incentives. Operating lease expense for lease payments is recognized on a straight-line basis over the lease term. Lease terms are based on the non-cancelable term of the lease and may contain options to extend the lease when it is reasonably certain that the Company will exercise that option.

Leases with an initial lease term of 12 months or less are not recorded on the consolidated balance sheet. Lease expense for these leases is recognized on a straight-line basis over the lease term.

(m) Land use right

The land use rights represent the operating lease prepayments for the rights to use the land in the PRC under ASC 842. Amortization of the prepayments is provided on a straight-line basis over the terms of the respective land use rights certificates.

(n) Long-term investments

The Company’s long-term investments consist of equity investments without readily determinable fair value, equity method investments and available-for-sale debt investments.

Prior to adopting ASC Topic 321, Investments—Equity Securities (“ASC 321”) on January 1, 2018, the Company carries at cost its investments in investees that do not have readily determinable fair value and over which the Company does not have significant influence, in accordance with ASC Subtopic 325‑20, Investments-Other: Cost Method Investments (“ASC 325‑20”). The Company only adjusts the carrying value of such investments for other-than-temporary decline in fair value and for distribution of earnings that exceed the Company’s share of earnings since its investment.

Management regularly evaluates the impairment of equity investments without readily determinable fair value based on the performance and financial position of the investee as well as other evidence of market value. Such evaluation includes, but is not limited to, reviewing the investee’s cash position, recent financing, projected and historical financial performance, cash flow forecasts and financing needs. An impairment loss is recognized in earnings equal to the excess of the investment’s cost over its fair value at the balance sheet date of the reporting period for which the assessment is made. The fair value would then become the new cost basis of the investment.

The Company adopted ASC 321 on January 1, 2018 and the cumulative effect of adopting the new standard on opening retained deficit is nil. Pursuant to ASC 321, equity investments, except for those accounted for under the equity method and those that result in consolidation of the investee and certain other investments, are measured at fair value, and any changes in fair value are recognized in earnings. For equity securities without readily determinable fair value and do not qualify for the existing practical expedient in ASC Topic 820, Fair Value Measurements and Disclosures (“ASC 820”), to estimate fair value using the net asset value per share (or its equivalent) of the investment, the Company elected to use the measurement alternative to measure those investments at cost, less any impairment, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer, if any. Equity securities with readily determinable fair value are measured at fair values, and any changes in fair value are recognized in earnings.

Pursuant to ASC 321, for equity investments measured at fair value with changes in fair value recorded in earnings, the Company does not assess whether those securities are impaired. For those equity investments that the Company elects to use the measurement alternative, the Company makes a qualitative assessment of whether the investment is impaired at each reporting date. If a qualitative assessment indicates that the investment is impaired, the entity has to estimate the investment’s fair value in accordance with the principles of ASC 820. If the fair value is less than the investment’s carrying value, the entity has to recognize an impairment loss in net loss equal to the difference between the carrying value and fair value.

Available-for-sale debt investments are convertible debt instruments issued by private companies, which are measured at fair value, with unrealized gains or losses recorded in accumulated other comprehensive income.

Investments in equity investees represent investments in entities in which the Company can exercise significant influence but does not own a majority equity interest or control are accounted for using the equity method of accounting in accordance with ASC Subtopic 323‑10, Investments-Equity Method and Joint Ventures: Overall (“ASC 323‑10”). The Company applies the equity method of accounting that is consistent with ASC 323‑10 in limited partnerships in which the Company holds a three percent or greater interest. Under the equity method, the Company initially records its investment at cost and prospectively recognizes its proportionate share of each equity investee’s net profit or loss into its consolidated statements of operations. The difference between the cost of the equity investee and the amount of the underlying equity in the net assets of the equity investee is recognized as equity method goodwill included in equity method investments on the consolidated balance sheets. The Company evaluates its equity method investments for impairment under ASC 323‑10. An impairment loss on the equity method investments is recognized in the consolidated statements of operations when the decline in value is determined to be other-than-temporary.

(o) Goodwill

Goodwill represents the excess of the purchase price over the amounts assigned to the fair value of the assets acquired and the liabilities assumed of an acquired business. In accordance with ASC Topic 350, Goodwill and Other Intangible Assets (“ASC 350”), recorded goodwill amounts are not amortized, but rather are tested for impairment annually or more frequently if there are indicators of impairment present.

In accordance with ASC 350, the Company assigned and assessed goodwill for impairment at the reporting unit level. A reporting unit is an operating segment or one level below the operating segment. In 2017, there were two reporting units consisting of two service lines namely hosting and related services and managed network services. The goodwill was reassigned to the two reporting units using a relative fair value allocation approach.

After the disposal of WiFire Entities and Aipu Group as defined in Note 4 in September 2017, the Company determined that there is only hosting and related services remained and hence the Company as a whole is one reporting unit as of December 31, 2018 and 2019.

The Company early adopted ASU No. 2017‑04, Simplifying the Test for Goodwill Impairment (“ASU 2017‑04”), which simplifies the accounting for goodwill impairment by eliminating Step two from the goodwill impairment test. Under the new guidance, if a reporting unit’s carrying amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. Fair value is primarily determined by computing the future discounted cash flows expected to be generated by the reporting unit.

Immediately before the disposal of WiFire Entities and Aipu Group in September 2017, the Company completed its impairment test for goodwill in managed network services. The Company determined the fair value of the reporting unit using the income approach based on the discounted expected cash flows associated with the reporting unit. The discounted cash flows for the reporting unit were based on five-year projections. Cash flow projections were based on past experience, actual operating results and management best estimates about future developments as well as certain market assumptions. Cash flows after five years were estimated using a terminal value calculation, which considered terminal value growth at 3%, considering the long-term revenue growth for entities in a similar industry in the PRC. The discount rate of approximately 13% was derived and used in the valuations which reflect the market assessment of the risks specific to the Company and its industry and is based on its weighted average cost of capital. The resulting fair value of the reporting unit significant lower than its carrying value, the Company fully impaired goodwill in managed network services and recorded an amount of RMB766 million for impairment loss of goodwill as of December 31, 2017.

Pursuant to ASC 350, in 2018 and 2019, the Company performed a qualitative assessment for hosting and related services and completed its annual impairment test for goodwill that has arisen out of its acquisitions. The Company evaluated all relevant factors including, but not limited to, macroeconomic conditions, industry and market conditions, financial performance, and the share price of the Company. The Company weighed all factors in their entirety and concluded that it was not more-likely-than-not the fair value was less than the carrying amount of the reporting unit, and further impairment testing on goodwill was unnecessary. No impairment loss of goodwill in hosting and related services was recognized for the years ended December 31, 2018 and 2019.

(p) Impairment of long-lived assets

The Company evaluates its long-lived assets or asset group, including intangible assets with finite lives, for impairment whenever events or changes in circumstances (such as a significant adverse change to market conditions that will impact the future use of the assets) indicate that the carrying amount of an asset or a group of long-lived assets may not be recoverable. When these events occur, the Company evaluates for impairment by comparing the carrying amount of the assets to future undiscounted net cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected undiscounted cash flow is less than the carrying amount of the assets, the Company would recognize an impairment loss based on the excess of the carrying amount of the asset group over its fair value. Fair value is generally determined by discounting the cash flows expected to be generated by the assets, when the market prices are not readily available for the long-lived assets.

As of December 31, 2017, due to continued operational losses, the Company recorded the long-lived assets impairment amounting to RMB170,695 and RMB231,113 for the asset groups of Aipu Group and WiFire Entities, respectively, resulting from excess of the carrying amount of the asset groups over their fair values of the two asset groups, respectively.

The Company determined the fair value of the asset groups using the income approach based on the discounted expected cash flows associated with the respective asset groups. The discounted cash flows for the asset groups were based on seven year projections for Aipu and five years for WiFire Entities, which are consistent with the remaining useful lives of its principal assets. Cash flow projections were based on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. The discount rate of approximately 13% was derived and used in the valuations which reflect the market assessment of the risks specific to the Company and its industry and is based on its weighted average cost of capital. No impairment was recognized in other assets groups as there was no impairment indicator identified.

The impairment loss reduced the carrying amount of the long-lived assets of a group on a pro-rata basis using the relative carrying amount of those assets.

In 2018 and 2019, the Company performed a qualitative assessment for impairment on whether events or changes in circumstances indicate that the carrying amount of an asset or a group of long-lived assets might not be recoverable. No impairment was recognized for the year ended December 31, 2018 and 2019 as there was no impairment indicator identified.

The Company recorded impairment charges associated with its long-lived assets and acquired intangibles as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Impairment of equipment	237,956	—	—	—
Impairment of intangible assets	163,852	—	—	—

(q) Fair value of financial instruments

The Company’s financial instruments include cash and cash equivalents, restricted cash, short-term investments, accounts receivable and payable, other receivables and payables, bonds payable, short-term and long-term bank borrowings, available-for-sale investments, liability classified restricted share units (“RSU”). Other than the bonds payable and long-term bank borrowings, the carrying values of these financial instruments approximate their fair values due to their short-term maturities.

The carrying amounts of bonds payable and long-term bank borrowings approximate their fair values since they bear interest rates which approximate market interest rates.

(r) Revenue recognition

The Company provides hosting and related services including hosting of customers’ servers and networking equipment, connecting customers’ servers with internet backbones (“Hosting service”), virtual private network services providing encrypted secured connection to public internet (“VPN service”) and other value-added services and public cloud service through strategic partnership with Microsoft.

On January 1, 2018, the Company adopted ASU No. 2014-09, Revenue from Contracts with Customers (“ASC 606”), which supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition (“ASC 605”), using the modified retrospective transition method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts have not been adjusted and continue to be reported in accordance with historic accounting under ASC 605. The impact of adopting the new revenue standard was not material to consolidated financial statements and there was no adjustment to beginning retained earnings on January 1, 2018.

Under ASC 606, an entity recognizes revenue as the Company satisfies a performance obligation when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of ASC 606, the entity performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price, including variable consideration, if any; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The Company only applies the five-step model to contracts when it is probable that the entity will collect the consideration to which it is entitled in exchange for the goods or services it transfers to the customer.

Once a contract is determined to be within the scope of ASC 606 at contract inception, the Company reviews the contract to determine which performance obligations it must deliver and which of these performance obligations are distinct. The Company recognizes revenue based on the amount of the transaction price that is allocated to each performance obligation when that performance obligation is satisfied or as it is satisfied.

The Company is a principal and records revenue on a gross basis when the Company is primarily responsible for fulfilling the service, has discretion in establish pricing and controls the promised service before transferring that service to customers. Otherwise, the Company records revenue at the net amounts as commissions.

The Company’s revenue recognition policies effective on the adoption date of ASC 606 are as follows:

Hosting services are services that the Company dedicates data center space to house customers’ servers and networking equipment and provides tailored server administration services including operating system support and assistance with updates, server monitoring, server backup and restoration, server security evaluation, firewall services, and disaster recovery. The Company also provides interconnectivity services to connect customers with each other, internet backbones in China and other networks through Border Gateway Protocol, or BGP, network, or single-line, dual-line or multiple-line networks. Hosting services are typically provided to customers for a fixed amount over the contract service period and the related revenues are recognized on a straight-line basis over the term of the contract. For certain contracts where considerations are based on the usage of the Hosting services, the related revenues are recognized based on the consumption at the predetermined rate as the services are rendered throughout the contact term. The Company is a principal and records revenue for Hosting service on a gross basis.

VPN services are services that the Company extends customers’ private networks by setting up secure and dedicated connections through the public internet. VPN services are provided to customers for a fixed amount over the contract service period and revenue are recognized on a straight-line basis over the term of the contract. The Company is a principal and records revenue for VPN service on a gross basis.

Cloud services allow businesses to run their applications over the internet using the IT infrastructure. Revenue from Cloud services consisted of incentive revenue from Microsoft upon completion of certain conditions and a fixed percentage amount based on gross sales price generated from Cloud services provided to end customers. Cloud services are generally provided to end customers for a fixed amount over the contract period and the related revenues are recognized on a straight-line basis over the contract period. For certain contracts where considerations are based on the usage of the cloud resources, the related revenues are recognized based on the consumption at the predetermined rate as the services are rendered throughout the contract term. The Company records revenue for Cloud service on a net basis.

For certain arrangements, customers are required to pay the Company before the services are delivered. When either party to a revenue contract has performed, the Company recognizes a contract asset or a contract liability in the consolidated balance sheets, depending on the relationship between the Company’s performance and the customer’s payment. Contract liabilities were mainly related to fee received for Hosting services to be provided over the contract period, which were presented as deferred revenue on the consolidated balance sheets.

Deferred revenue represented the Company’s obligation to transfer the goods or services to a customer for which the Company has received consideration (or an amount of consideration is due) from the customer. As of December 31, 2018 and 2019, the Company has deferred revenue amounting up to RMB57,754 and RMB57,625 (US$8,277), respectively. Revenue recognized from opening deferred revenue balance was RMB46,996 (US$6,751) for the year ended December 31, 2019.

The Company does not disclose the value of unsatisfied performance obligations as the Company’s revenue contracts are (i) contracts with an original expected length of one year or less or (ii) contracts for which the Company recognizes revenue at the amount to which it has the right to invoice for services performed.

(s) Cost of revenues

Cost of revenues consists primarily of telecommunication costs, depreciation of the Company’s long-lived assets, amortization of acquired intangible assets, maintenance, data center rental expenses directly attributable to the provision of the IDC services, payroll and other related costs of operations.

(t) Advertising expenditures

Advertising expenditures are expensed as incurred and are included in sales and marketing expenses, which amounted to RMB7,773, RMB7,968 and RMB6,095 (US$875) for the years ended December 31, 2017, 2018 and 2019, respectively.

(u) Research and development expenses

Research and development expenses consist primarily of payroll and related personnel costs for routine upgrades and related enhancements of the Company’s services and network. Research and development expenses are expensed as incurred.

(v) Government grants

Government grants are provided by the relevant PRC municipal government authorities to subsidize the cost of certain research and development projects. The amount of such government grants are determined solely at the discretion of the relevant government authorities and there is no assurance that the Company will continue to receive these government grants in the future. Government grants are recognized when it is probable that the Company will comply with the conditions attached to them, and the grants are received. When the grant relates to an expense item, it is recognized in the consolidated statement of operations over the period necessary to match the grant on a systematic basis to the costs that it is intended to compensate, as a reduction of the related operating expense. When the grant relates to an asset, it is recognized as deferred government grants and released to the consolidated statement of operations in equal amounts over the expected useful life of the related asset, when operational, as a reduction of the related depreciation expense.

(w) Capitalized interest

Interest costs are capitalized if they are incurred during the acquisition, construction or production of a qualifying asset and such costs could have been avoided if expenditures for these assets have not been made.

As a result of total interest costs capitalized during the period, the interest expense for the years ended December 31, 2017, 2018 and 2019, was as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Interest expense and amortization cost of bonds payable	63,354	150,098	223,832	32,151
Interest expense on bank borrowings	87,916	19,395	14,212	2,041
Interest expense on finance lease	63,757	79,935	120,185	17,263
Total interest costs	215,027	249,428	358,229	51,455
Less: Total interest costs capitalized	(29,714)	(13,362)	(12,274)	(1,762)
Interest expense, net	185,313	236,066	345,955	49,693

(x) Income taxes

The Company accounts for income taxes using the liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial reporting and tax bases of assets and liabilities using enacted tax rates that will be in effect in the period in which the differences are expected to reverse. The Company records a valuation allowance against deferred tax assets if, based on the weight of available evidence, it is more-likely-than-not that some portion, or all, of the deferred tax assets will not be realized. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date of the change in tax rate. All deferred income tax assets and liabilities are classified as non-current on the consolidated balance sheets.

The Company applies ASC Topic 740, Accounting for Income Taxes (“ASC 740”), to account for uncertainty in income taxes. ASC 740 prescribes a recognition threshold a tax position is required to meet before being recognized in the financial statements.

The Company has elected to classify interest and penalties related to unrecognized tax benefits, if and when required, as part of “income tax benefits (expenses)” in the consolidated statements of operations.

(y) Share-based compensation

Share options and Restricted Share Units (“RSUs”) granted to employees are accounted for under ASC Topic 718, Compensation—Stock Compensation (“ASC 718”), which requires that share-based awards granted to employees be measured based on the grant date fair value and recognized as compensation expenses over the requisite service period and/or performance period (which is generally the vesting period) in the consolidated statements of operations. The Company accounts for forfeitures as they occur.

The Company has elected to recognize compensation expenses using the straight-line method for share-based awards granted with service conditions that have a graded vesting schedule. For share-based awards granted with performance conditions, the Company recognizes compensation expenses using the accelerated method. The Company commences recognition of the related compensation expenses if it is probable that the defined performance condition will be met. To the extent that the Company determines that it is probable that a different number of share-based awards will vest depending on the outcome of the performance condition, the cumulative effect of the change in estimate is recognized in the period of change. For share-based awards with market conditions, the probability to achieve market conditions is reflected in the grant date fair value. The Company recognized the related compensation expenses when the requisite service is rendered using the accelerate method.

On November 26, 2016, the Board approved a new incentive program to certain individuals with a new bonus scheme which will be settled by issuing a variable number of shares with a fair value equal to fixed dollar amount on the settlement date. The Company remeasures the fair value of such liability at each reporting period end through earnings until the actual settlement date, which is the date when the number of underlying shares were fixed and recorded the compensation cost over the remaining vesting term.

For the performance bonuses that the employees can elect to settle in cash and/or restricted shares of the Company (“Share-Settled Bonus”), the Company estimates the portion of the arrangement to be settled in shares based on its past settlement practices and classifies such portion as a liability in accordance with ASC Topic 480, Distinguishing Liabilities from Equity (“ASC 480”) as the Company can only settle the Share-Settled Bonus by issuing variable number of shares until the settlement date. The Company remeasures the fair value of such liability at each reporting period end through earnings until the underlying shares were approved and granted to the employees and accounted for the granted restricted shares unit as equity award. The original cash bonus amount continues to be classified as a liability within “Accrued expenses and other payables” in the consolidated balance sheets.

A cancellation of the terms or conditions of an equity award under original award in exchange for a new award should be treated as modification. The compensation costs associated with the modified awards are recognized if either the original vesting conditions or the new vesting conditions have been achieved. Total recognized compensation cost for the awards is at least equal to the fair value of the original awards at the grant date unless at the date of the modification the performance or service conditions of the original awards are not expected to be satisfied. The incremental compensation cost is measured as the excess of the fair value of the replacement awards over the fair value at the modification date. Therefore, in relation to the modified awards, the Company recognizes share-based compensation over the vesting periods of the new awards, which comprises (i) the amortization of the incremental portion of share-based compensation over the remaining vesting term, and (ii) any unrecognized compensation cost of original awards, using either the original term or the new term, whichever results in higher expenses for each reporting period. For modification of a liability award that remains a liability after modification, the liability award continues to be remeasured at fair value at each reporting date.

In January, 2017, the Company made revisions to the Share-Settled Bonus to remove the option to settle bonus accrued in 2017. For the Share-Settled Bonus accrued in 2016 which were elected to be settled in shares, the Company issued shares to settle all the Share-Settled Bonus as of December 31, 2017.

(z) Loss per share

In accordance with ASC Topic 260, Earnings per Share (“ASC 260”), basic loss per share is computed by dividing net loss attributable to ordinary shareholders by the weighted average number of unrestricted ordinary shares outstanding during the year. Diluted loss per share is calculated by dividing net loss attributable to ordinary shareholders as adjusted for the effect of dilutive ordinary equivalent shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the period. Contingently issuable shares, including performance-based share awards and contingent considerations to be settled in shares, are included in the computation of basic earnings per share only when there is no circumstance under which those shares would not be issued. Contingently issuable shares are included in the denominator of the diluted loss per share calculation as of the beginning of the period or as of the inception date of the contingent share arrangement, if later, only when dilutive and when all the necessary conditions have been satisfied as of the reporting period end. For contracts that may be settled in ordinary shares or in cash at the election of the Company, share settlement is presumed, pursuant to which incremental shares relating to the number of shares that would be required to settle the contract are included in the denominator of diluted loss per share calculation if the effect is more dilutive. For the contracts that may be settled in ordinary shares or in cash at the election of the counterparty, the more dilutive option of cash or share settlement is used for the purposes of diluted loss per share calculation, pursuant to which share settlement requires the number of shares that would be required to settle the contract be included in the denominator whereas cash settlement requires an adjustment to be made to the numerator for any changes in income or loss that would result as if the contract had been classified as an asset or a liability for accounting purposes during the period for a contract that is classified as equity for accounting purposes, if the effect is more dilutive. Ordinary equivalent shares consist of the ordinary shares issuable upon the exercise of the share options, using the treasury stock method. Ordinary share equivalents are excluded from the computation of diluted loss per share if their effects would be anti-dilutive.

(aa) Share repurchase program

Pursuant to the Board of Directors’ resolutions on December 2, 2019, the Company’s management is authorized to repurchase, in one or more tranches, up to an aggregate of US$20,000 of its own outstanding shares (including shares represented by ADSs) (each such transaction a “Repurchase”) over a period of 13 months ending on December 31, 2020.

The Company accounted for the repurchased shares as Treasury Stock at cost in accordance to ASC Subtopic 505‑30, Treasury Stock (“ASC 505‑30”), and the share repurchase is shown separately in the consolidated statement of shareholder’s equity, as the Company has not yet decided on the ultimate disposition of those ADSs acquired. When the Company decides to retire the treasury stock, the difference between the original issuance price and the repurchase price is debited into accumulated deficit.

For the years ended December 31, 2017, 2018 and 2019, the Company repurchased 3,448,482, nil and 242,830 ADSs for a consideration of RMB133,126, nil and RMB11,840 (US$1,701), respectively.

(bb) Comprehensive loss

Comprehensive loss is defined as the decrease in equity of the Company during a period from transactions and other events and circumstances excluding transactions resulting from investments by owners and distributions to owners. Accumulated other comprehensive income of the Company includes only foreign currency translation adjustments related to the Company and its overseas subsidiaries, whose functional currency is US$.

(cc) Segment reporting

In accordance with ASC Topic 280, Segment Reporting (“ASC 280”), the Company historically had two reportable segment since the Company’s chief executive officer, who has been identified as the Company’s chief operating decision-maker (“CODM”) formerly relied on the results of operations of hosting and related services and managed network services separately when making decisions on allocating resources and assessing performance of the Company. Hosting and related services business focuses primarily on colocation, interconnectivity, cloud, VPN, hybrid IT and other value-added services. Managed network services focuses on businesses that primarily utilize bandwidth such as content delivery network (“CDN”) service, hosting area network services and last-mile wired broadband service.

In September 2017, the Company disposed WiFire Entities and Aipu Group, which are primarily engaged in the managed network services. After the disposal, the Company has only one hosting and related services remained and the CODM reviews the operation result of the Company as a whole. As of December 31, 2018 and 2019, the Company only had one reporting segment.

(dd) Employee benefits

The full-time employees of the Company’s PRC subsidiaries are entitled to staff welfare benefits including medical care, housing fund, pension benefits and unemployment insurance, which are governmental mandated defined contribution plans. These entities are required to accrue for these benefits based on certain percentages of the employees’ respective salaries, subject to certain ceilings, in accordance with the relevant PRC regulations, and make cash contributions to the state-sponsored plans out of the amounts accrued.

(ee) Comparatives

Certain items reported in the prior year’s consolidated financial statements have been reclassified to conform with the current year’s presentation.

(ff) Recent accounting pronouncements

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments — Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. The standard will replace “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. For available-for-sale debt securities, entities will be required to record allowances rather than reduce the carrying amount, as they do today under the other-than-temporary impairment model. The standard is effective for public business entities for annual periods beginning after December 15, 2019, and interim periods therein. The Company does not currently anticipate the adoption of this ASU to have a material impact to its consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (“ASU 2018-13”). ASU 2018-13 modifies the disclosure requirements for fair value measurements by removing, modifying, or adding certain disclosures. The amendments in ASU 2018-13 will be effective for the Company beginning after January 1, 2020 including interim periods within the year. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of ASU No. 2018-13 and delay adoption of the additional disclosures until their effective date. The Company does not expect the impact of this guidance to have a material impact on the Company’s consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This update simplifies the accounting for income taxes as part of the FASB's overall initiative to reduce complexity in accounting standards. The amendments include removal of certain exceptions to the general principles of ASC 740, Income taxes, and simplification in several other areas such as accounting for a franchise tax (or similar tax) that is partially based on income. The update is effective in fiscal years beginning after December 15, 2020, and interim periods therein, and early adoption is permitted. Certain amendments in this update should be applied retrospectively or modified retrospectively, all other amendments should be applied prospectively. The Company does not expect the impact of this guidance to have a material impact on the Company’s consolidated financial statements.

CONCENTRATION OF RISKS

12 Months Ended

Dec. 31, 2019

CONCENTRATION OF RISKS

CONCENTRATION OF RISKS

3. CONCENTRATION OF RISKS

(a) Credit risk

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments, accounts receivable, other receivables and amounts due from related parties. As of December 31, 2018 and 2019, the aggregate amount of cash and cash equivalents, restricted cash and short-term investments of RMB1,131,588 and RMB1,171,075 (US$168,214), respectively, were held at major financial institutions located in the PRC, and US$258,083 and US$222,638 (RMB1,549,958), respectively, were deposited with major financial institutions located outside the PRC. Management believes that these financial institutions are of high credit quality and continually monitors the credit worthiness of these financial institutions. Historically, deposits in Chinese banks are secure due to the state policy on protecting depositors’ interests. However, China promulgated a new Bankruptcy Law in August 2006 that came into effect on June 1, 2007, which contains a separate article expressly stating that the State Council may promulgate implementation measures for the bankruptcy of Chinese banks based on the Bankruptcy Law. Under the new Bankruptcy Law, a Chinese bank may go into bankruptcy. In addition, since China’s concession to the World Trade Organization, foreign banks have been gradually permitted to operate in China and have been significant competitors against Chinese banks in many aspects, especially since the opening of the Renminbi business to foreign banks in late 2006. Therefore, the risk of bankruptcy of those Chinese banks in which the Company has deposits has increased. In the event of bankruptcy of one of the banks which holds the Company’s deposits, the Company is unlikely to claim its deposits back in full since the bank is unlikely to be classified as a secured creditor based on PRC laws.

(b) Business, supplier, customer, and economic risk

The Company participates in a relatively dynamic and competitive industry that is heavily reliant operation excellence of the services. The Company believes that changes in any of the following areas could have a material adverse effect on the Company’s future financial position, result of operations or cash flows:

(i) Business Risk—Third parties may develop technological or business model innovations that address data center and network requirements in a manner that is, or is perceived to be, equivalent or superior to the Company’s services. If competitors introduce services that compete with, or surpass the quality, price or performance of the Company’s services, the Company may be unable to renew its agreements with existing customers or attract new customers at the prices and levels that allow the Company to generate reasonable rates of return on its investment.

(ii) Supplier Risk—The Company’s operations are dependent upon bandwidth and cabinet capacity provided by the third-party telecom carriers. There can be no assurance that the Company will be able to secure the cabinet and bandwidth supply from the third-party telecom carriers, neither the Company is adequately prepared for unexpected increases in bandwidth demands by its customers. The communications capacity the Company has leased, include cabinet and bandwidth, may become unavailable for a variety of reasons, such as physical interruption, technical difficulties, contractual disputes, or the financial health of its third-party providers. Any failure of these network providers to provide the capacity the Company requires may result in a reduction in, or interruption of, service to its customers. A significant portion of the Company’s total bandwidth and cabinet resources are purchased from its five largest suppliers, who collectively accounted for 21%, 19% and 21% of the Company’s total bandwidth and cabinet resources for the years ended December 31, 2017, 2018 and 2019, respectively.

(iii) Customer Risk—The success of the Company’s business going forward will rely in part on Group’s ability to continue to obtain and expand business from existing customers while also attracting new customers. The Company has a diversified base of customers covering its services and the revenue from the largest single entity customer accounted for less than 8% of the Company’s total net revenues in the year ended December 31, 2019. Certain customers are local subsidiaries of a telecommunication carrier in China, which the Company views as separate customers as it negotiates with, maintain and support each of these entities given that each of them has the separate decision-making authority and services procurement budget. None of these customers on a stand-alone basis contributed more than 3% of the Company’s revenues in any given year but in the aggregate, they contributed approximately 2%, 4% and 4% of the Company’s total revenues for the years ended December 31, 2017, 2018 and 2019, respectively.

(iv) Political, economic and social uncertainties—The Company’s operations could be adversely affected by significant political, economic and social uncertainties in the PRC. Although the PRC government has been pursuing economic reform policies for more than 20 years, no assurance can be given that the PRC government will continue to pursue such policies or that such policies may not be significantly altered, especially in the event of a change in leadership, social or political disruption or unforeseen circumstances affecting the PRC political, economic and social conditions. There is also no guarantee that the PRC government’s pursuit of economic reforms will be consistent or effective.

(v) Regulatory restrictions—The applicable PRC laws, rules and regulations currently prohibit foreign ownership of companies that provide internet related services, including hosting and related services. Accordingly, the Company’s subsidiary, 21Vianet China, is currently ineligible to apply for the required licenses for providing IDC services in China. As a result, the Company operates its IDC services in the PRC through its Consolidated VIEs which holds the licenses and permits required to provide IDC services in the PRC. The PRC Government may also choose at anytime to block access to certain website operators which could also materially impact the Company’s ability to generate revenue.

The Company transacts substantially all its business in RMB, which is not freely convertible into foreign currencies. On January 1, 1994, the PRC government abolished the dual-rate system and introduced a single rate of exchange as quoted daily by the People’s Bank of China (the “PBOC”). However, the unification of the exchange rates does not imply that the RMB may be readily convertible into US$ or other foreign currencies. All foreign exchange transactions continue to take place either through the PBOC or other banks authorized to buy and sell foreign currencies at the exchange rates quoted by the PBOC. Approval of foreign currency payments by the PBOC or other institutions requires submitting a payment application form together with suppliers’ invoices, shipping documents and signed contracts.

(d) Foreign currency exchange rate risk

From July 21, 2005, the RMB is permitted to fluctuate within a narrow and managed band against a basket of certain foreign currencies. The (appreciation) depreciation of the RMB against US$ was approximately (5.8)%, 5.0% and 1.6% in the years ended December 31, 2017, 2018 and 2019, respectively.

(e) Interest rate risk

The Company is exposed to interest rate risk on its interest-bearing assets and liabilities. As part of its asset and liability risk management, the Company reviews and takes appropriate steps to manage its interest rate exposures on its interest-bearing assets and liabilities. The Company has not been exposed to material risks due to changes in market interest rates, and not used any derivative financial instruments to manage the interest risk exposure during the periods presented.

ACQUISITION AND DISPOSAL OF SUBSIDIARIES

12 Months Ended

Dec. 31, 2019

ACQUISITION AND DISPOSAL OF SUBSIDIARIES

ACQUISITION AND DISPOSAL OF SUBSIDIARIES

4. ACQUISITION AND DISPOSAL OF SUBSIDIARIES

Acquisitions in 2019

BJ Shuhai

On January 2, 2019, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interests in BJ Shuhai at a total cash consideration of RMB98,255 (US$14,113) in installment upon achievement of certain conditions which is accounted as contingent consideration and the corresponding asset will only be recognized when the contingency is resolved. The purpose is to establish a new data center with the acquired property. As BJ Shuhai does not possess all the elements that are necessary to conduct normal operations as a business and had not yet commenced operations, such acquisition is accounted for as an acquisition of assets. As of December 31, 2019, the condition of the last payment of the total consideration was not yet met. RMB30,000 (US$4,309) in relation to the last payment was considered as a contingent consideration. The carrying amounts of the net identifiable assets of BJ Shuhai were as follows:


	RMB	US$
Net assets acquired:
Operating permits (Note 9)	100,380	14,419
Cash and cash equivalents	59	8
Other current assets	9,625	1,383
Right-of-use assets	129,937	18,664
Other current liabilities	(16,714)	(2,401)
Lease liabilities	(129,937)	(18,664)
Deferred tax liabilities	(25,095)	(3,605)
Total consideration in cash	68,255	9,804

Shihua Holdings 2

In March 2017, the Company and Warburg Pincus set up a joint venture, Shihua Holdings 2, with the equity interest of 49% and 51%, respectively (Note 12). The Company accounted for the investment in the joint venture under equity method investments for its ability to exercise significant influence.

In July 2019, the Company entered into restructuring agreements with Warburg Pincus and the transaction. Pursuant to the restructuring agreement, Shihua Holdings 2 transferred 100% of the equity interest in some subsidiaries at the consideration equivalent to the subsidiaries’ paid-in capital to Warburg Pincus’s wholly owned subsidiaries, Marble SH and Marble Holdings. Thereafter, Shihua Holdings 2 repurchased and cancelled all Warburg Pincus’s shares in Shihua Holdings 2. Upon completion of restructuring on August 20, 2019, the Company became the sole shareholder in Shihua Holdings 2, including its wholly owned subsidiary, Hongming Logistics. As Shihua Holdings 2 and its subsidiaries do not possess all the elements that are necessary to conduct normal operations as a business and had not yet commenced operations, such acquisition is accounted for as an acquisition of assets. The carrying amounts of the net identifiable assets of Shihua Holdings 2 at the acquisition date were as follows:


	RMB	US$
Net assets acquired:
Property and land use right	150,880	21,672
Construction-in-progress	465	67
Cash and cash equivalents	67,563	9,705
Other current assets	1,333,329	191,521
Other current liabilities	(1,203,894)	(172,929)
Deferred tax liabilities	(33,096)	(4,754)
Total consideration*	315,247	45,282

*Consideration transferred is the carrying amount of the previously held 49% of equity interest.

NT Chenghong

On December 24, 2019, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interests in NT Chenghong with total cash consideration of RMB80,000 (US$11,491). The purpose of this transaction for the Company is to acquire the property to establish a new data center. As NT Chenghong does not possess all the elements that are necessary to conduct normal operations as a business and had not yet commenced operations, such acquisition is accounted for as an acquisition of assets. The carrying amounts of the net identifiable assets of NT Chenghong at the acquisition date were as follows:


	RMB	US$
Net assets acquired:
Construction-in-progress	158,471	22,763
Equipment	13	2
Cash and cash equivalents	129	18
Other current assets	11,840	1,701
Other current liabilities	(88,830)	(12,760)
Deferred tax liabilities	(1,623)	(233)
Total consideration in cash	80,000	11,491

Disposals in 2017

In September 2017, six wholly-owned subsidiaries engaged in CDN, hosting area network services and route optimization businesses, namely Guangzhou Gehua Network Technology Development Co., Ltd., CYSD, Zhiboxintong (Beijing) Network Technology Co., Ltd., WiFire BJ, BJ Fastweb and SH Guotong (collectively, the "Wifire Entities") and Sichuan Aipu Network Co., Ltd. (“SC Aipu”) and its affiliates (collectively, the “Aipu Group”), which are engaged in the last-mile broadband business, were deconsolidated by the Company.

Disposal of WiFire Entities

In September 2017, the Company transferred 66.67% of the equity interest in the WiFire Entities for a nominal consideration of RMB6 yuan for each of the WiFire Entities to Beijing TUS Yuanchuang Technology Development Co., Ltd., a wholly-owned subsidiary of Tus-Holdings, the controlling shareholder of the Company. Upon completion of disposal, the Company accounted for the remaining 33.33% of equity interest in the WiFire Entities as equity method investments under ASC 323‑10 for its ability to exercise significant influence in the WiFire Entities.

Disposal of Aipu Group

In September 2017, the Company transferred two shares in SC Aipu to Mr. Jian Li, the Co-CEO and a director of SC Aipu, for a nominal consideration of RMB1 yuan. Immediately after the disposal, the Company’s ownership in SC Aipu changed from 50% equity interest plus one share to 50% equity interest minus one share and lost control. The Company accounted for the remaining equity interest as equity method investment for its ability to exercise significant influence in the Aipu Group.

Subsequently in December 2017, the Company transferred all the remaining 50% equity interest minus one share in SC Aipu to Tibet Xingtao Culture Communications Co., Ltd., one of SC Aipu’s shareholders, for a nominal consideration of RMB1 yuan.

In addition to the impairment losses for long-lived assets and goodwill of RMB401,808 and RMB766,440, respectively, recognized in relation to Wifire Entities and Aipu Group before the disposal, the Company recognized a gain on disposal of WiFire Entities and Aipu Group of RMB497,036 for the year ended December 31, 2017.

ACCOUNTS AND NOTES RECEIVABLE, NET

12 Months Ended

Dec. 31, 2019

ACCOUNTS AND NOTES RECEIVABLE, NET

ACCOUNTS AND NOTES RECEIVABLE, NET

5. ACCOUNTS AND NOTES RECEIVABLE, NET

Accounts and notes receivable and the allowance for doubtful debt consisted of the following:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Accounts receivable	592,669	722,840	103,830
Notes receivable	2,606	2,146	308
Allowance for doubtful debt	(70,970)	(67,828)	(9,743)
	524,305	657,158	94,395

As of December 31, 2018 and 2019, all accounts and notes receivable were due from third party customers. An analysis of the allowance for doubtful debt was as follows:


	For the years ended December 31,
	2018	2019
	RMB	RMB	US$
Balance at beginning of the year	73,656	70,970	10,194
Additional provision charged to expense	315	485	70
Write-off of accounts receivable	(3,001)	(3,627)	(521)
Balance at the end of the year	70,970	67,828	9,743

SHORT-TERM INVESTMENTS

12 Months Ended

Dec. 31, 2019

SHORT-TERM INVESTMENTS

SHORT-TERM INVESTMENTS

6. SHORT-TERM INVESTMENTS

Short-term investments consisted of the following as of December 31, 2018 and 2019:

The Company recorded interest income related to its short-term investments amounting to RMB4,021, RMB7,303 and RMB8,687 (US$1,248) for the years ended December 31, 2017, 2018 and 2019, respectively, in the consolidated statements of operations.

PREPAID EXPENSES AND OTHER CURRENT ASSETS

12 Months Ended

Dec. 31, 2019

PREPAID EXPENSES AND OTHER CURRENT ASSETS

PREPAID EXPENSES AND OTHER CURRENT ASSETS

7. PREPAID EXPENSES AND OTHER CURRENT ASSETS

Prepaid expenses and other current assets consisted of the following:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Prepaid expenses	565,710	878,155	126,139
Tax recoverables	421,654	570,913	82,007
Staff advances	10,730	1,866	268
Interest receivables	12,037	14,359	2,063
Deposits	39,971	17,391	2,498
Loan to third parties	58,909	73,557	10,565
Others	50,563	61,908	8,893
	1,159,574	1,618,149	232,433

Prepaid expenses mainly represented the unamortized portion of prepayments made to Microsoft for the cloud computing services, the prepayments to telecommunication operators for bandwidth, data centers or cabinets and the prepayments for office expense.

PROPERTY AND EQUIPMENT, NET

12 Months Ended

Dec. 31, 2019

PROPERTY AND EQUIPMENT, NET

PROPERTY AND EQUIPMENT, NET

8. PROPERTY AND EQUIPMENT, NET

Property and equipment, including those held under finance leases, consisted of the following:


	As of December 31,
	2018	2019
	RMB	RMB	US$
At cost:
Property	753,319	899,609	129,221
Leasehold improvements	932,896	1,458,749	209,536
Computer and network equipment	3,260,336	3,539,709	508,447
Optical fibers	142,723	142,723	20,501
Office equipment	24,390	22,102	3,175
Motor vehicles	1,841	2,308	331
	5,115,505	6,065,200	871,211
Less: Accumulated depreciation	(1,870,640)	(2,514,800)	(361,228)
	3,244,865	3,550,400	509,983
Construction-in-progress	786,377	1,893,165	271,936
	4,031,242	5,443,565	781,919

Depreciation expense was RMB523,500, RMB566,491 and RMB696,528 (US$100,050) for the years ended December 31, 2017, 2018 and 2019, respectively, and were included in the following captions:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Cost of revenues	458,655	520,791	644,108	92,520
Sales and marketing expenses	3,188	986	2,107	303
General and administrative expenses	41,675	28,727	30,110	4,325
Research and development expenses	19,982	15,987	20,203	2,902
	523,500	566,491	696,528	100,050

The carrying amounts of the Company’s property and equipment held under finance leases at respective balance sheet dates were as follows:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Property	365,353	365,353	52,480
Computer and network equipment	719,676	639,311	91,831
Optical fibers	142,723	142,723	20,501
	1,227,752	1,147,387	164,812
Less: Accumulated depreciation	(291,579)	(408,196)	(58,634)
	936,173	739,191	106,178
Construction-in-progress	576,022	659,014	94,661
	1,512,195	1,398,205	200,839

Depreciation of property, computer and network equipment and optical fibers under finance leases was RMB92,920, RMB170,264 and RMB216,664 (US$31,122) for the years ended December 31, 2017, 2018 and 2019, respectively.

The carrying amounts of property and equipment pledged by the Company to secure banking borrowings (Note 13) granted to the Company at the respective balance sheet dates were as follows:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Property	140,393	137,585	19,763
Leasehold improvements	71,337	66,162	9,504
Computer and network equipment	74,822	—	—
Office equipment	44	—	—

INTANGIBLE ASSETS, NET

12 Months Ended

Dec. 31, 2019

INTANGIBLE ASSETS, NET

INTANGIBLE ASSETS, NET

9. INTANGIBLE ASSETS, NET

The following table presented the Company’s intangible assets as of the respective balance sheet dates:


		Radio									Internal
	Purchased	spectrum	Operating	Contract	Customer		Supplier	Trade	Platform	Non-compete	use
	software	license	Permits	backlog	relationships	Licenses	relationships	names	software	agreements	software	Total
	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB
Intangible assets, net January 1, 2018	50,629	77,141	—	11,750	137,882	4,268	20,144	96,404	683	154	2,060	401,115
Additions	18,744	—	—	—	—	—	—	—	—	—	6,093	24,837
Disposals	(6,772)	—	—	—	—	—	—	—	—	—	—	(6,772)
Foreign currency translation difference	364	3,884	—	—	—	—	—	—	—	—	—	4,248
Amortization expense	(15,711)	(8,117)	—	(6,588)	(24,921)	(385)	(3,074)	(5,813)	(683)	(110)	(2,713)	(68,115)
Intangible assets, net December 31, 2018	47,254	72,908	—	5,162	112,961	3,883	17,070	90,591	—	44	5,440	355,313
Additions	11,128	—	100,380	—	—	—	—	—	—	—	13,189	124,697
Foreign currency translation difference	413	1,200	—	—	—	—	—	—	—	—	—	1,613
Amortization expense	(16,068)	(8,985)	(3,136)	(5,162)	(24,921)	(385)	(3,074)	(5,813)	—	(44)	(3,440)	(71,028)
Intangible assets, net December 31, 2019	42,727	65,123	97,244	—	88,040	3,498	13,996	84,778	—	—	15,189	410,595
Intangible assets, net December 31, 2019 (US$)	6,137	9,354	13,968	—	12,646	503	2,010	12,178	—	—	2,182	58,978

Contract backlog relate to the order placed by the customers that have yet to be delivered at the acquisition date. Customer relationships relate to the relationships that arose as a result of existing customer agreements acquired and is derived from the estimated net cash flows that are expected to be derived from the expected renewal of these existing customer agreements after subtracting the estimated net cash flows from other contributory assets. Licenses mainly represented the telecommunication service license in relation to virtual private network services. Supplier relationships relate to the relationships that arose as a result of existing bandwidth supply agreements with certain network operators, which were valued using a replacement cost method given the relative ease of replacement. Trade names mainly relate to the trade names of Dermot Entities. Operating permits relate to the government authorized high-capacity utilities in the assets acquisition of BJ Shuhai (Note 4).

The intangible assets are amortized using the straight-line method, which is the Company’s best estimate of how these assets will be economically consumed over their respective estimated useful lives ranging from 1 to 32 years.

Amortization expenses were approximately RMB143,602, RMB68,115 and RMB71,028 (US$10,203) for the years ended December 31, 2017, 2018 and 2019, respectively.

The annual estimated amortization expenses for the intangible assets for each of the next five years are as follows:


	RMB	US$
2020	59,115	8,491
2021	55,400	7,958
2022	50,005	7,183
2023	34,274	4,923
2024	13,820	1,985
	212,614	30,540

LAND USE RIGHTS, NET

12 Months Ended

Dec. 31, 2019

LAND USE RIGHTS, NET

LAND USE RIGHTS, NET

10. LAND USE RIGHTS, NET

Land use rights held by the Company represent operating lease prepayments and are amortized over the remaining term of the respective rights.


	As of December 31,
	2018	2019
	RMB	RMB	US$
Cost	159,494	249,804	35,882
Accumulated amortization	(12,001)	(16,650)	(2,392)
Land use rights, net	147,493	233,154	33,490

The carrying amounts of land use rights pledged by the Company to secure banking borrowings (Note 13) granted to the Company at the respective balance sheet dates were as follows:

GOODWILL

12 Months Ended

Dec. 31, 2019

GOODWILL

GOODWILL

11. GOODWILL

The changes in the carrying amount of goodwill were as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Balance as of January 1	1,755,970	989,530	989,530	142,137
Impairment	(766,440)	—	—	—
Balance as of December 31	989,530	989,530	989,530	142,137

In September 2017, goodwill included in managed network services reporting unit was fully impaired immediately before disposal of WiFire Entities and Aipu Group. As of December 31, 2017, no impairment loss of goodwill in hosting and related services was recorded.

As of December 31, 2018 and 2019, the Company has performed a qualitative assessment for hosting and related services and no impairment loss was recorded for this year.

LONG-TERM INVESTMENTS

12 Months Ended

Dec. 31, 2019

LONG-TERM INVESTMENTS

LONG-TERM INVESTMENTS

12. LONG-TERM INVESTMENTS

The Company’s long-term investments consisted of the following:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Equity investments without readily determinable fair values	51,410	43,824	6,295
Equity method investments	490,376	124,116	17,828
Available-for-sale debt investments	2,537	1,713	246
	544,323	169,653	24,369

Equity investments without readily determinable fair values

The Company disposed equity investments without readily determinable fair value at a consideration of RMB26,653 and RMB13,122 (US$1,885) in 2018 and 2019, respectively.

The investment income comprised of dividend income of RMB406 and RMB461 (US$66), and disposal gain of RMB20,496 and RMB5,536 (US$795) for the years ended December 31, 2018 and 2019, respectively.

The Company recorded an impairment loss of long-term investment amounting RMB20,258, nil and nil for the years ended December 31, 2017, 2018 and 2019, respectively.

Equity method investments:


				Increase (decrease)
				during
				the year ended
	As of December 31, 2017			December 31, 2018			As of December 31, 2018
		Share	Investments					Share	Investments	Investments
	Cost of	equity	in equity	Cost of	Share	Derecognize of	Cost of	equity gain	in equity	in equity
	investments	gain (loss)	investee	investments	equity loss	share equity loss	investments	(loss)	investee	investee
	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	US$
Yizhuang Fund	101,000	176,036	277,036	—	(150,355)	—	101,000	25,681	126,681	18,425
Unis Tech	49,000	(12,961)	36,039	(49,000)	(3,548)	16,509	—	—	—	—
Shihua DC Holdings	147,176	(9,429)	137,747	219,447	(24,229)	—	366,623	(33,658)	332,965	48,428
Jingliang Inter Cloud	—	—	—	6,000	(34)	—	6,000	(34)	5,966	868
Jingliang Century Cloud	—	—	—	4,000	—	—	4,000	—	4,000	582
Huaye Cloud	—	—	—	23,333	(6,319)	—	23,333	(6,319)	17,014	2,474
ZJK Energy	—	—	—	5,907	(2,157)	—	5,907	(2,157)	3,750	545
WiFire Entities	15,000	(15,000)	—	—	—	—	15,000	(15,000)	—	—
	312,176	138,646	450,822	209,687	(186,642)	16,509	521,863	(31,487)	490,376	71,322


				Increase (decrease)
				during
				the year ended
	As of December 31, 2018			December 31, 2019			As of December 31, 2019
		Share	Investments		Share	Distribution/derecognize		Share	Investments	Investments
	Cost of	equity	in equity	Cost of	equity gain	of share	Cost of	equity gain	in equity	in equity
	investments	gain (loss)	investee	investments	(loss)	equity (gain) loss	investments	(loss)	investee	investee
	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	US$
Yizhuang Fund	101,000	25,681	126,681	—	1,671	(20,200)	101,000	7,152	108,152	15,535
Shihua DC Holdings	366,623	(33,658)	332,965	(337,555)	(17,718)	22,308	29,068	(29,068)	—	—
Jingliang Inter Cloud	6,000	(34)	5,966	—	(1,894)	—	6,000	(1,928)	4,072	585
Jingliang Century Cloud	4,000	—	4,000	—	—	—	4,000	—	4,000	575
Huaye Cloud	23,333	(6,319)	17,014	(23,333)	(11,534)	17,853	—	—	—	—
ZJK Energy	5,907	(2,157)	3,750	—	212	—	5,907	(1,945)	3,962	569
WiFire Entities	15,000	(15,000)	—	5,000	(5,000)	—	20,000	(20,000)	—	—
Qidi Chengxin	—	—	—	3,930	—	—	3,930	—	3,930	564
	521,863	(31,487)	490,376	(351,958)	(34,263)	19,961	169,905	(45,789)	124,116	17,828

In April 2012, the Company through its subsidiary, 21Vianet Beijing, entered into an agreement to invest in the Yizhuang Venture Investment Fund (“Yizhuang Fund”) as a limited partner with an amount of RMB50,500. In December 2013, the Company made the second tranche of investment of another amount of RMB50,500 in the Yizhuang Fund, and held 27.694% of the investee as of December 31, 2017, 2018 and 2019. Given the Company holds more than three percent interest in the Yizhuang Fund as a limited partner, the investment is accounted for under the equity method as prescribed in ASC Subtopic 323‑10, Investments – Equity Method (“ASC 323‑10”). In December 2019, the Company received distribution from Yizhuang Fund as return on investments with an amount of RMB20,200 (US$2,902).

In June 2016, the Company through its subsidiary, 21Vianet Beijing, and a related company jointly set up Unisplendour-Vianet Technology Inc. (“Unis Tech”). The Company injected capital of RMB49,000 to acquire 49% of equity interest in Unis Tech with the ability to exercise significant influence. In March 2018, the Company disposed all its equity interests in the Unis Tech with a total cash consideration of RMB49,000 and recognized investment loss with an amount of RMB3,548 and disposal gain with an amount of RMB16,509.

In March 2017, the Company through its subsidiary, 21Vianet HK, and Warburg Pincus jointly set up two JVs, Shihua Holdings 2 and Shihua Investment Management (collectively, "Shihua DC Holdings”). The Company injected capital of RMB133,639 and RMB13,537 to acquire 49% of equity interest in Shihua Holdings 2 and Shihua Investment Management, respectively. In the year of 2018, the Company increased the capital injection with the amount of RMB203,916 and RMB15,531 in Shihua Holdings 2 and Shihua Investment Management, respectively. In July 2019, the Company entered into restructuring agreements with Warburg Pincus. Pursuant to the restructuring agreements, Shihua Holdings 2 repurchased and cancelled Warburg Pincus's share in Shihua Holdings 2. Upon completion of restructuring on August 20, 2019, Shihua Holdings 2 became a wholly-owned subsidiary of the Company (Note 4), thus RMB337,555 (US$48,487) and RMB22,308 (US$3,204) of cost of investment and accumulative share equity loss in Shihua Holdings 2 were derecognized as of December 31,2019. Pursuant to the restructuring agreements, the Company and Warburg Pincus would inject additional capital on pro-rata basis to liquidate and terminate Shihua Investment Management. Therefore, the Company recognized additional share equity loss in Shihua Investment Management with an amount of RMB16,290 (US$2,340) as of December 31, 2019.

In September 2017, after the disposal of 66.67% equity interest in the WiFire Entities, the Company held the remaining 33.33% equity interest in the WiFire Entities, which is accounted for equity method investment at fair value of RMB6 yuan at the disposal date. In December 2017, the Company injected capital of RMB15,000 in the WiFire Entities pursuant to the sale and purchase agreement. In 2019, the Company increased capital injection of RMB5,000 (US$716) in the WiFire Entities. As of December 31, 2019, the equity method investment balance is reduced to nil after the pickup of loss in the WiFire Entities.

In January 2018, the Company through its subsidiary, 21Vianet Beijing, and a third company jointly set up Beijing Jingliang Interconnected Cloud Technology Inc. (“Jingliang Inter Cloud”) and Jingliang Century Cloud Technology Inc. (“Jingliang Century Cloud”). The Company injected capital of RMB6,000 and RMB4,000 and the Company held 60% and 40% of equity interest in Jingliang Inter Cloud and Jingliang Century Cloud, respectively. Based on the article of association, the Company cannot exercise control over relevant activities of the investee, but it has the ability to exercise significant influence over Jingliang Inter Cloud’s operation and financial decisions.

In March 2018, the Company through its subsidiary, 21Vianet Beijing, acquired 50% equity interest in Guangdong Huaye Cloud Inc. (“Huaye Cloud”) with an amount of RMB23,333, with the ability to exercise significant influence. In November 2019, the Company disposed all its equity interest in Huaye Cloud with a total cash consideration of RMB23,333(US$3,352) and recognized investment loss with an amount of RMB17,853(US$2,564) and disposal gain with an amount of RMB17,853(US$2,564).

In December 2019, the Company through its subsidiary, 21Vianet Beijing, and a third company jointly set up Chengdu Qidi Chengxin Education Limit ("Qidi Chengxin"). The Company injected capital of RMB3,930 (US$564) and hold 59% of equity interest in Qidi Chengxin. Based on the article of association, the Company cannot exercise control over relevant activities of the investee, but it has the ability to exercise significant influence over operation and financial decisions.

Available-for-sale debt investments

Available-for-sale debt investments consist of investments in convertible notes with conversion option to preferred shares that are not readily convertible to cash and therefore the bifurcation of embedded derivative is not required as the conversion option did not qualify as derivatives in accordance with ASC 815 “Derivatives and Hedging”.

BANK BORROWINGS

12 Months Ended

Dec. 31, 2019

BANK BORROWINGS

BANK BORROWINGS

13. BANK BORROWINGS

Bank borrowings were as follows as of the respective balance sheet dates:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Short-term bank borrowings	50,000	234,500	33,684
Long-term bank borrowings, current portion	75,284	32,500	4,668
	125,284	267,000	38,352
Long-term bank borrowings, non-current portion	112,000	79,500	11,419
Total bank borrowings	237,284	346,500	49,771

The short-term bank borrowings outstanding as of December 31, 2018 and 2019 bore a weighted average interest rate of 4.05% and 4.56% per annum, respectively, and were denominated in RMB. These borrowings were obtained from financial institutions and have terms of one year. The long-term bank borrowings (including current portion) outstanding as of December 31, 2018 and 2019 bore a weighted average interest rate of 5.31% and 5.28% per annum, respectively, and were denominated in RMB. These loans were obtained from financial institutions located in the PRC.

As of December 31, 2018 and 2019, unused loan facilities for bank borrowings amounted to RMB21,375 and RMB326,068 (US$46,837), respectively.

Bank borrowings as of December 31, 2018 and 2019 were secured by the following:


December 31, 2018
Short-term bank borrowings		Secured by
(RMB)
50,000		Secured by restricted cash of RMB60,796.
50,000

Long-term bank borrowings (including current portion)		Secured by
(RMB)
138,000		Secured by a subsidiary’s fixed assets and land-use right with net book value of RMB286,596 and RMB16,403, respectively (Note 8/Note 10).
49,284		Unsecured borrowings.
187,284


December 31, 2019
Short-term bank borrowings		Secured by
(RMB)
34,500		Unsecured borrowings.

200,000		Secured by restricted cash of RMB215,816 (US$31,000).
234,500

Long-term bank borrowings (including current portion)		Secured by
(RMB)
112,000		Secured by a subsidiary’s fixed assets and land-use right with net book value of RMB203,747 (US$29,267) and RMB15,989 (US$2,297), respectively (Note 8/Note 10).
112,000

ACCRUED EXPENSES AND OTHER PAYABLES

12 Months Ended

Dec. 31, 2019

ACCRUED EXPENSES AND OTHER PAYABLES

ACCRUED EXPENSES AND OTHER PAYABLES

14 ACCRUED EXPENSES AND OTHER PAYABLES

The components of accrued expenses and other payables were as follows:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Payroll and welfare payables	224,265	179,195	25,740
Value-added tax and other taxes payable	16,931	14,523	2,086
Payables for office supplies and utilities	21,719	24,562	3,528
Payables for the purchase of property and equipment	207,512	551,759	79,255
Payables for the purchase of intangible assets	4,576	2,934	421
Accrued service fees	41,618	52,746	7,576
Interest payables	54,376	58,961	8,469
Liability classified RSU	4,970	2,109	303
Payables for acquisitions	47,755	47,805	6,867
Others	35,598	44,341	6,368
	659,320	978,935	140,613

LEASES

12 Months Ended

Dec. 31, 2019

LEASES

LEASES

15. LEASES

Leases are classified as operating leases or finance leases in accordance with ASC 842. The Company's operating leases mainly related to building, office facilities and equipment and the rights to use the land in the PRC. For leases with terms greater than 12 months, the Company records the related asset and liability at the present value of lease payments over the term. Certain leases include rental escalation clauses, renewal options and/or termination options, which are factored into the Company's determination of lease payments when appropriate.

As of December 31, 2019, the operating lease's weighted average remaining lease term was 9.4 years and weighted average discount rate was 6.09%. The finance lease's weighted average remaining lease term was 15.3 years and weighted average discount rate was 8.43%. For the year ended December 31, 2019, lease cost for finance leases capitalized was immaterial.


	For the year ended December 31,
	2019
	RMB	US$
Lease cost
Finance lease cost:
Depreciation	216,664	31,122
Interest expenses	120,185	17,263
Operating lease cost	214,795	30,853
Total lease cost	551,644	79,238

Short-term lease cost and variable lease cost for operating leases and finance leases were immaterial for the year ended December 31, 2019.

Other information related to leases was as follows:


	2019
	RMB	US$
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash payments for operating leases	193,174	27,748
Financing cash payments for finance leases	333,614	47,921

Future lease payments under operating leases and finance leases as of December 31, 2019 were as follows:


	Operating Leases		Finance Leases
	RMB	US$	RMB	US$
2020	466,670	67,033	364,729	52,390
2021	373,552	53,657	386,027	55,449
2022	160,644	23,075	377,564	54,234
2023	87,028	12,501	122,947	17,660
2024	47,484	6,821	121,008	17,382
2025 and thereafter	647,419	92,996	1,880,687	270,144
Total future lease payments	1,782,797	256,083	3,252,962	467,259
Less: Imputed interest	(533,376)	(76,615)	(1,563,446)	(224,575)
Present value of future lease payments *	1,249,421	179,468	1,689,516	242,684

Present value of future finance lease payments consisted of current portion of finance lease liabilities, non-current portion of finance lease liabilities and finance lease liabilities in amounts due to related parties, amounting to RMB227,115 (US$32,623), RMB896,927 (US$128,836) and RMB565,474 (US$81,225) for the year ended December 31, 2019, respectively.

BONDS PAYABLE

12 Months Ended

Dec. 31, 2019

BONDS PAYABLE

BONDS PAYABLE

16. BONDS PAYABLE

On August 17, 2017, the Company issued and sold bonds with an aggregate principle amount of US$200,000 at a coupon rate of 7% per annum or the Original Bonds. On September 29, 2017, the Company issued and sold follow-on bonds with an aggregate principle amount of US$100,000 at a coupon rate of 7% per annum, or the Bonds. The Bonds were priced at a slight premium of 100.04%, with an effective yield of 6.98% (together with the Original Bonds, “2020 Notes”). The 2020 Notes will mature on August 17, 2020. The 2020 Notes were listed and quoted on the Official List of the Singapore Exchange Securities Trading Limited (the “SGX-ST”). Interest on the 2020 Notes is payable semi-annually in arrears on August 17 and February 17 in each year, beginning from February 17, 2018.

Net proceeds from 2020 Notes after deducting issuance costs were RMB1,926,419. The 2020 Notes are unsecured and rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated to the bonds; equal in right of payment to any of the Company’s liabilities that are not so subordinated; but rank lower than any secured indebtedness of the Company and all liabilities (including accounts payable) of the Company’s subsidiaries and Consolidated VIEs.

On April 15, 2019, the Company issued and sold bonds with an aggregate principle amount of US$300,000 at a coupon rate of 7.875% per annum ("2021 Notes"). The 2021 Notes will mature on October 15, 2021. The 2021 Notes were listed and quoted on the SGX-ST. Interest on the 2021 Notes is payable semi-annually in arrears on April 15 and October 15 in each year, beginning from October 15, 2019.

Net proceeds from 2021 Notes after deducting issuance costs were RMB1,976,474 (US$283,903). The 2021 Notes are unsecured and rank senior in right of payment to any of the Company's indebtedness that is expressly subordinated to the bonds; equal in right of payment to any of the Company's liabilities that are not so subordinated, including the 2020 Notes; effectively junior in the right of payment to any secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including accounts payables) of the Company's subsidiaries and Consolidated VIEs.

On April 16, 2019, the Company repurchased US$150,839 in principal amount of 2020 Notes, representing approximately 50.28% of the US$300,000 total aggregate principal amount of the 2020 Notes outstanding as at such date. On August 12, 2019, the Company repurchased US$18,000 in principal amount of 2020 Notes. The remaining outstanding 2020 Notes with principal amount of US$131,161 continue to be the obligation of the Company. The Company recognized loss on debt extinguishment of RMB18,895 (US$2,714) during the year ended December 31, 2019.

The following table summarizes the aggregate required repayments of the principal amounts of the Company’s long-term borrowings, including the bonds payable and bank borrowings (Note 13) in the succeeding five years and thereafter:


	RMB	US$
For the years ending December 31,
2020	947,505	136,100
2021	2,131,860	306,223
2022	40,500	5,817
2023 and thereafter	—	—

DEFERRED GOVERNMENT GRANTS

12 Months Ended

Dec. 31, 2019

DEFERRED GOVERNMENT GRANTS

DEFERRED GOVERNMENT GRANTS

17. DEFERRED GOVERNMENT GRANTS

During the years ended December 31, 2017, 2018 and 2019, the Company received RMB2,877, RMB500 and nil, respectively, in government grants from the relevant PRC government authorities for the use in construction of property and equipment. These grants are initially deferred and subsequently recognized in the consolidated statements of operations when the Company has complied with the conditions or performance obligations attached to the related government grants, if any, and the grants are no longer refundable. Grants that subsidize the construction cost of property and equipment are amortized over the life of the related assets as a reduction of the associated depreciation expense.

Movements of deferred government grants were as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Balance at beginning of the year	30,993	22,435	15,792	2,268
Additions	2,877	500	—	—
Decrease due to disposal of subsidiaries	(3,573)	—	—	—
Recognized as a reduction of depreciation expense	(7,862)	(7,143)	(7,291)	(1,047)
Balance at end of the year	22,435	15,792	8,501	1,221

TREASURY STOCK	12 Months Ended
TREASURY STOCK	Dec. 31, 2019
TREASURY STOCK
TREASURY STOCK	18. TREASURY STOCK For the years ended December 31, 2017, 2018 and 2019, the Company repurchased the number of 3,448,482, nil and 242,830 ADSs pursuant to the share repurchase plans.

ACCUMULATED OTHER COMPREHENSIVE INCOME

12 Months Ended

Dec. 31, 2019

ACCUMULATED OTHER COMPREHENSIVE INCOME

ACCUMULATED OTHER COMPREHENSIVE INCOME

19. ACCUMULATED OTHER COMPREHENSIVE INCOME

The changes in accumulated other comprehensive income by component, net of tax of nil, were as follows:


		Foreign currency
		translation
		RMB
Balance as of January 1, 2017		118,290
Current year other comprehensive income		(120,963)
Balance as of December 31, 2017		(2,673)
Current year other comprehensive loss		88,652
Balance as of December 31, 2018		85,979
Current year other comprehensive income		(8,075)
Balance as of December 31, 2019		77,904
Balance as of December 31, 2019, in US$		11,190

MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN	12 Months Ended
MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN	Dec. 31, 2019
MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN
MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN	20. MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN As stipulated by the regulations of the PRC, full-time employees of the Company in the PRC participate in a government-mandated multiemployer defined contribution plan organized by municipal and provincial governments. Under the plan, certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. The Company is required to make contributions to the plan based on certain percentages of employees’ salaries. The total expenses for the plan were RMB134,053, RMB122,362 and RMB121,266 (US$17,419) for the years ended December 31, 2017, 2018 and 2019, respectively.

SHARE-BASED COMPENSATION

12 Months Ended

Dec. 31, 2019

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION

21. SHARE-BASED COMPENSATION

(a) Option granted to employees

In order to provide additional incentives to employees and to promote the success of the Company’s business, the Company adopted a share incentive plan in 2010 (the “2010 Plan”). Under the 2010 Plan, the Company may grant options and RSUs to its employees, directors and consultants to purchase an aggregate of no more than 39,272,595 ordinary shares of the Company. The 2010 Plan was approved by the Board of Directors and shareholders of the Company on July 16, 2010. The 2010 Plan is administered by the Board of Directors or the Compensation Committee of the Board as set forth in the 2010 Plan (the “Plan Administrator”). All share options to be granted under the 2010 Plan have a contractual term of ten years and generally vest over 3 to 4 years in the grantee’s option agreement.

In order to further promote the success and enhance the value, the Company adopted a share incentive plan in 2014 (the “2014 Plan”). Under the 2014 Plan, the Company may issue an aggregate of no more than 20,461,380 shares (“Maximum Number”) and such Maximum Number should be automatically increased by a number that is equal to 15% of the number of new shares issued by the Company from time to time. The maximum aggregate number of ordinary shares to be issued under 2014 Plan was subsequently amended to 39,606,817, as approved by the Board of Directors and shareholders of the Company on October 30, 2015. All share options, restricted shares and restricted share units to be granted under the 2014 Plan have a contractual term of ten years and generally vest over 3 to 4 years in the grantee’s option agreement.

The Company granted 611,111, 487,368 and 464,120 RSUs in 2017, 2018 and 2019, respectively, with performance conditions whereby a predetermined number will vest upon the assignment of an annual performance review in accordance with predetermined performance targets for the grantees over a one or four-year period. As it is probable for the Company to estimate the annual performance review ratings for the individual grantees, the Company commenced recognition of the related compensation expenses using the accelerated recognition method.

The Company granted 2,188,226 and 64,000 RSUs in 2018 and 2019, respectively, with performance conditions whereby a predetermined number will vest upon with the achievement of predetermined operation performance targets for the Company. As it is probable for the Company to estimate the operation performance for the Company, the Company commenced recognition of the related compensation expenses using the accelerated recognition method.

The Company granted 547,056 and 16,000 RSUs in 2018 and 2019, respectively, with market conditions whereby a predetermined number will vest upon with the achievement of predetermined share price targets for the Company. The probability to achieve market condition is reflected in the grant date fair value of the award and thus compensation cost is recognized when the requisite service is rendered using the accelerated method.

The compensation expenses related to remaining unvested share options shall be recognized over the remaining requisite service period or the performance review period. As of December 31, 2019, options to purchase 1,445,345 of ordinary shares were outstanding.

The following table summarized the Company’s employee share option activity under the 2010 Plan:


			Weighted
		Weighted	average
		average	remaining	Aggregate
	Number of	exercise	contractual	intrinsic
	options	price	term	value
		(US$)	(Years)	(US$)
Outstanding, January 1, 2019	1,479,214	0.51	2.2
Exercised	(33,869)	0.55
Outstanding, December 31, 2019	1,445,345	0.51	1.3	1,005
Vested and expected to vest at December 31, 2019	1,445,345	0.51	1.3	1,005
Exercisable as of December 31, 2019	1,445,345	0.51	1.3	1,005

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the fair value of the underlying stock at each reporting date, for those awards that have an exercise price below the estimated fair value of the Company’s shares. As of December 31, 2019, the Company had options outstanding to purchase an aggregate of 1,445,345 shares with an exercise price below the fair value of the Company’s shares, resulting in an aggregate intrinsic value of RMB6,997 (US$1,005).

The aggregate fair value of the outstanding options at the grant date was determined to be RMB14,508 (US$2,084) as of December 31, 2019 and such amount is recognized as share-based compensation expenses using the straight-line method for all employee share options granted with graded vesting based on service conditions and the accelerated method for share options granted with graded vesting based on performance conditions. The total fair value of share options exercised during the years ended December 31, 2017, 2018 and 2019 was US$404, US$239 and US$42, respectively. The aggregate intrinsic value of options exercised during the years ended December 31, 2017, 2018 and 2019 was US$306, US$248, and US$22, respectively.

As of December 31, 2019, the Company has recorded all the share-based compensation expenses in relation to outstanding share options.

The following table summarized the Company’s RSUs activity under the 2014 Plan:


		Weighted	Weighted
		average	average	Aggregate
	Number of	grant date	remaining	intrinsic
	RSUs	fair value	contractual life	value
		(US$)	(Years)	(US$)
Unvested, January 1, 2019	3,218,452	6.66	9
Granted	544,120	7.67
Vested	(856,051)	7.22
Forfeited	(210,392)	6.52
Unvested, December 31, 2019	2,696,129	6.83	7.8	19,547

Share-based compensation expenses for RSUs are measured based on the closing fair market value of the Company’s ADS on the date of grant and the reporting date for liability classified RSUs, respectively. The aggregate fair value of the unvested RSUs as of December 31, 2019 was RMB136,082 (US$19,547), and such amount is recognized as share-based compensation expenses using the straight-line method for the RSUs with graded vesting based on service conditions and the accelerated method for the RSUs with graded vesting based on performance conditions, market conditions and share-settled bonuses. The weighted average grant date fair value of RSUs granted during the years ended December 31, 2017, 2018 and 2019 was US$6.31, US$6.39 and US$7.67, respectively. The total fair value of RSUs vested during the years ended December 31, 2017, 2018 and 2019 was US$18,238, US$9,422 and US$6,185, respectively.

As of December 31, 2019, there was RMB59,913 (US$8,606) of unrecognized share-based compensation expenses related to RSUs which is expected to be recognized over a weighted average vesting period of 2.5 years. Total unrecognized share-based compensation expenses may be adjusted for future changes when actual forfeitures incurred.

(b) Shares issued to management of Dermot Entities

For the years ended December 31, 2017, 2018 and 2019, the Company recorded share-based compensation expenses of RMB5,752, nil and nil within the Company’s consolidated statements of operations, respectively.

Total share-based compensation expenses relating to share options and RSUs granted to employees recognized for the years ended December 31, 2017, 2018 and 2019 were as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Cost of revenues	(277)	2,668	1,884	271
Sales and marketing expenses	(681)	2,139	354	51
General and administrative expenses	47,945	53,346	40,501	5,817
Research and development expenses	142	1,385	1,177	169
	47,129	59,538	43,916	6,308

TAXATION

12 Months Ended

Dec. 31, 2019

TAXATION

TAXATION

22. TAXATION

Enterprise income tax (“EIT”)

Cayman Islands

The Company is incorporated in the Cayman Islands and conducts its primary business operations through the subsidiaries and VIEs in the PRC and Hong Kong. Under the current laws of the Cayman Islands, the Company is not subject to tax on income or capital gain arising in Cayman Islands. Additionally, upon payments of dividends by the Company to its shareholders, no Cayman Islands withholding tax will be imposed.

British Virgin Islands

Subsidiaries in British Virgin Islands are not subject to tax on income or capital gains under the current laws of the British Virgin Islands. Additionally, upon payments of dividends by the Company to its shareholders, no British Virgin Islands withholding tax will be imposed.

Hong Kong

Subsidiaries in Hong Kong are subject to Hong Kong profits tax rate of 16.5% for the years ended December 31, 2017, 2018 and 2019. Additionally, upon payments of dividends by the Company to its shareholders, no HK withholding tax will be imposed.

Taiwan

DYX Taiwan branch is incorporated in Taiwan and is subject to Taiwan profits tax rate of 17%, 20% and 20% respectively for the years ended December 31, 2017, 2018 and 2019.

The PRC

The Company’s PRC subsidiaries are incorporated in the PRC and subject to the statutory rate of 25% on the taxable income in accordance with the Enterprise Income Tax Law (The “EIT Law”), which was effective since January 1, 2008, except for certain entities eligible for preferential tax rates.

Dividends, interests, rent or royalties payable by the Company’s PRC subsidiaries, to non-PRC resident enterprises, and proceeds from any such non-resident enterprise investor’s disposition of assets (after deducting the net value of such assets) shall be subject to 10% withholding tax, unless the respective non-PRC resident enterprise’s jurisdiction of incorporation has a tax treaty or arrangements with China that provides for a reduced withholding tax rate or an exemption from withholding tax.

21Vianet Beijing was qualified for a High and New Technology Enterprise (“HNTE”) since 2008 and is eligible for a 15% preferential tax rate. In October 2014, 21Vianet Beijing obtained a new certificate and renewed the certificate in October 2018, which will expire in October 2020. In accordance with the PRC Income Tax Laws, an enterprise awarded with the HNTE certificate may enjoy a reduced EIT rate of 15%. For the years ended December 31, 2017, 2018 and 2019, 21Vianet Beijing enjoyed a preferential tax rate of 15%.

In April 2011, Xi’an Sub, a subsidiary located in Shaanxi Province, was qualified for a preferential tax rate of 15% and started to apply this rate from then on. The preferential tax rate is awarded to companies that are located in West Regions of China which operate in certain encouraged industries. For the years ended December 31, 2017, 2018 and 2019, the tax rate assessed for Xi’an Sub was 25%, 15% and 15%, respectively.

In 2013, BJ iJoy was qualified as a software enterprise which allows BJ iJoy to utilize a two-year 100% exemption for 2013 and 2014 followed by a three-year half-reduced EIT rate effective for the years from 2015 to 2017. For the years ended December 31, 2013 and 2014, BJ iJoy enjoyed the 100% tax exemption for its taxable income. For the year ended December 31, 2017, BJ iJoy enjoyed the half-reduced EIT rate for its taxable income. For the years ended December 31, 2018 and 2019, BJ iJoy was subject to the statutory rate of 25% for the taxable income.

In October 2015, SH Blue Cloud, a subsidiary located in Shanghai, was qualified for a HNTE and became eligible for 15% preferential tax rate effective for three consecutive years. The certificate was renewed in October 2018 which will expire in October 2021. Accordingly, for the years ended December 31, 2017, 2018 and 2019, SH Blue Cloud enjoyed a preferential tax rate of 15%.

In November 2016, SZ DYX, a subsidiary located in Guangdong Province, was qualified for a HNTE and became eligible for 15% preferential tax rate effective for three consecutive years, expiring in November 2019 and the certificate was renewed in November 2019 which will expire in November 2022. Accordingly, for the years ended December 31, 2017, 2018 and 2019, SZ DYX enjoyed a preferential tax rate of 15%.

The New EIT Law also provides that enterprises established under the laws of foreign countries or regions and whose “place of effective management” is located within the PRC are considered PRC tax resident enterprises and subject to PRC income tax at the rate of 25% on worldwide income. The definition of “place of effective management” refers to an establishment that exercises, in substance, overall management and control over the production and business, personnel, accounting, properties, etc. of an enterprise. As of December 31, 2019, the administrative practice associated with interpreting and applying the concept of “place of effective management” is unclear. If the Company is deemed as a PRC tax resident, it will be subject to 25% PRC EIT under the New EIT Law on its worldwide income, meanwhile the dividend it receives from another PRC tax resident company will be exempted from 25% PRC income tax. The Company will continue to monitor changes in the interpretation or guidance of this law.

Loss before income taxes consisted of:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Non-PRC	(286,388)	(214,063)	(178,762)	(25,676)
PRC	(721,426)	51,738	2,953	424
	(1,007,814)	(162,325)	(175,809)	(25,252)

Income tax benefits (expenses) comprised of:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Current	(37,856)	(44,187)	(70,324)	(10,101)
Deferred	128,026	19,776	64,887	9,320
	90,170	(24,411)	(5,437)	(781)

The reconciliation of tax computed by applying the statutory income tax rate of 25% for the years ended December 31, 2017, 2018 and 2019 applicable to the PRC operations to income tax benefits (expenses) were as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Loss before income taxes	(1,007,814)	(162,325)	(175,809)	(25,252)
Income tax benefits computed at applicable tax rates (25%)	251,954	40,581	43,952	6,313
Non-deductible expenses	(5,468)	(2,834)	(23,082)	(3,316)
Research and development expenses	11,895	25,906	19,688	2,829
Preferential rate	(90,076)	11,701	20,213	2,903
Current and deferred tax rate differences	33,366	37,934	(8,699)	(1,250)
International rate differences	59,029	(63,525)	(77,066)	(11,069)
Tax exempted income	—	—	754	108
Unrecognized tax benefits	(6,259)	1,472	1,728	248
Deferred tax expense	2,851	—	—	—
Change in valuation allowance	(174,388)	(79,694)	25,423	3,652
Prior year provision to return true up	7,266	4,048	(8,348)	(1,199)
Income tax benefits (expenses)	90,170	(24,411)	(5,437)	(781)

Deferred Tax

The significant components of deferred taxes were as follows:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Deferred tax assets
Non-current
Allowance for doubtful debt	38,993	48,568	6,976
Accrued expenses	25,894	21,139	3,036
Tax losses	151,440	146,996	21,115
Property and equipment	15,299	20,567	2,955
Intangible assets	2,221	3,691	530
Finance lease	50,980	69,148	9,932
Deferred government grant	2,662	1,189	171
Loss picked up on equity method investments	56,616	56,706	8,145
Valuation allowance	(184,664)	(158,638)	(22,786)
Total deferred tax assets	159,441	209,366	30,074
Deferred tax liabilities
Non-current
Intangible assets	89,536	104,217	14,970
Property and equipment	48,496	81,424	11,696
Capitalized interest expense	15,837	15,146	2,176
Gain picked up from equity method investments	3,851	1,785	256
Total non-current deferred tax liabilities	157,720	202,572	29,098

Valuation allowance is considered for each of the entities. Realization of the net deferred tax assets is dependent on factors including future reversals of existing taxable temporary differences and adequate future taxable income, exclusive of reversing deductible temporary differences and tax loss or credit carry forwards. The Company evaluates the potential realization of deferred tax assets on an entity-by-entity basis. As of December 31, 2018 and 2019, valuation allowances were provided against deferred tax assets in entities where it was determined it was more likely than not that the benefits of the deferred tax assets will not be realized in future years.

As of December 31, 2019, the Company has net tax operating losses from its PRC subsidiaries and its Consolidated VIEs, as per filed tax returns, of RMB661,253 (US$94,983), which will expire between 2020 to 2029.

As of December 31, 2019, the Company intends to permanently reinvest the undistributed earnings from other foreign subsidiaries to fund future operations. As of December 31, 2019, the total amount of undistributed earnings from its PRC subsidiaries as well as VIEs was RMB1,317,809 (US$189,291). The amount of unrecognized deferred tax liabilities for temporary differences related to investments in foreign subsidiaries is not determined because such a determination is not practicable.

Unrecognized Tax Benefits

As of December 31, 2018 and 2019, the Company recorded unrecognized tax benefits of RMB6,677 and RMB2,443 (US$351), respectively.

The unrecognized tax benefits and its related interest are primarily related to non-deductible expenses and accrued expenses. RMB897 (US$129) of the total unrecognized tax benefits, ultimately recognized, will impact the effective tax rate. It is possible that the amount of uncertain tax benefits will change in the next 12 months, however, an estimate of the range of the possible outcomes cannot be made at this time.

A roll-forward of unrecognized tax benefits principle was as follows:


	For the years ended December 31,
	2018	2019
	RMB	RMB	US$
Balance at beginning of year	11,582	4,509	647
Reversal based on tax positions related to prior years	(9,070)	(3,266)	(469)
Additions based on tax positions related to the current year	1,997	479	69
Balance at end of year	4,509	1,722	247

For the years ended December 31, 2017, 2018 and 2019, the Company recorded (reversed) interest expense of RMB674, RMB(2,761) and RMB(1,447) (US$(211)), respectively. Accumulated interest expense recorded by the Company was RMB2,168 and RMB721 (US$104) as of December 31, 2018 and 2019, respectively. As of December 31, 2019, the tax years ended December 31, 2013 through 2019 for the PRC subsidiaries remain open for statutory examination by the PRC tax authorities.

RELATED PARTY TRANSACTIONS

12 Months Ended

Dec. 31, 2019

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS

23. RELATED PARTY TRANSACTIONS

a) Related parties *



Name of related parties		Relationship with the Company
Xiaomi Communication Technology Co., Ltd., and its subsidiary, Beijing Xiaomi Mobile Software Co., Ltd. (collectively, “Xiaomi Group”) (2)		A group controlled by principal shareholder of the Company
Beijing Kingsoft Cloud Network Technology Co., Ltd. (“BJ Kingsoft”) (1)		A company controlled by principal shareholder of the Company
Beijing Cheetah Mobile Technology Co., Ltd. (“BJ Cheetah”) (1)		A company controlled by principal shareholder of the Company
Unisvnet Technology Co., Ltd. (“Unisvnet”)		A company controlled by controlling shareholder of the Company
Beijing Tuspark Harmonious Investment Development Co., Ltd. (“Tuspark Harmonious”)		A company controlled by controlling shareholder of the Company
Ziguang Financial Leasing Co., Ltd. (“Ziguang Finance Leasing”)		A company controlled by controlling shareholder of the Company
Qidi Bus (Beijing) Technology Co., Ltd. (“Qidi Tech”)		A company controlled by controlling shareholder of the Company
Dyxnet Internet Center Limited (“DIC”)		A related party of seller of Dermot Entities
Dyxnet Data Centre Services Limited (“DCSS”)		A related party of seller of Dermot Entities
WNT Technology Limited (“WNT Technology”)		A related party of seller of Dermot Entities
Shanghai Shibei Hi-Tech Co., Ltd. (“SH Shibei”)		Noncontrolling shareholder of a subsidiary
Marble Stone SH Group Limited (“Marble SH”) (4)		A company controlled by minority shareholder of the Company
Marble Stone Holdings Limited (“Marble Holdings”) (4)		A company controlled by minority shareholder of the Company
Shihua DC Investment Holdings 2 Limited (“Shihua Holdings 2”)		Equity investee of the Company in 2017, 2018 and wholly-owned subsidiary since August 20, 2019 (Note 4)
Shihua DC Investment Management Limited (“Shihua Investment Management”)		Equity investee of the Company
Shihua DC Investment Management Group Limited (“Shihua Investment Group”)		Equity investee of the Company
Beijing Taiji Data Tech Co., Ltd. (“Taiji”)		Equity investee of the Company
Beijing Chengyishidai Network Engineering Technology Co., Ltd.(“CYSD”) (3)		Equity investee of the Company
WiFire (Beijing) Technology Co., Ltd. (“WiFire BJ”) (3)		Equity investee of the Company
Beijing Fastweb Network Technology Co., Ltd. (“BJ Fastweb”) (3)		Equity investee of the Company
Shanghai Fawei Technology Co., Ltd. (“SH Fawei”) (3)		Equity investee of the Company
Wuhan Fastweb Cloud Computing Co., Ltd. (“WH Fastweb”) (3)		Equity investee of the Company
Beijing Bozhi Ruihai Network Technology Co., Ltd. (“BZRH”) (3)		Equity investee of the Company
WiFire (Shanghai) Network Technology Co., Ltd. (“SH Guotong”) (3)		Equity investee of the Company
Jingliang Interconnected Cloud Technology Co., Ltd. (“Jingliang Inter Cloud”)		Equity investee of the Company

*These are the related parties that have engaged in significant transactions with the Company for the years ended December 31, 2017, 2018 and 2019.

(1)

These companies and Kingsoft are ultimately controlled by the same party. Kingsoft made a significant investment in the Company in 2015.

(2)

These companies and Xiaomi are ultimately controlled by the same party. Xiaomi made a significant investment in the Company in 2015.

(3)

These entities were disposed by the Company in September 2017, included in WiFire Entities, and determined by the Company as related parties as of December 31, 2017, 2018 and 2019.

(4)

These entities are controlled by Waburg Pincus, a significant minority shareholder of the Company.

b) Other than disclosed elsewhere, the Company had the following significant related party transactions for the years ended December 31, 2017, 2018 and 2019:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Services provided to:
- Xiaomi Group	220,110	374,085	437,694	62,871
- Taiji	—	13,681	7,899	1,135
- Qidi Tech	—	—	7,427	1,067
- BJ Kingsoft	8,046	6,281	3,475	499
- WiFire BJ	9,726	16,490	1,934	278
- BJ Cheetah	5,128	2,079	169	24
- Unisvnet	—	1,011	—	—
- Others	3,314	4,493	1,494	215
Services provided by:
- CYSD	2,979	18,667	38,918	5,590
- Taiji	—	7,095	19,942	2,865
- Jingliang Inter Cloud	—	3,477	8,829	1,268
- BJ Kingsoft	7,775	13,204	3,492	502
- DCSS	6,424	5,238	—	—
- BZRH	—	4,239	—	—
- WiFire BJ	1,616	4,066	—	—
- Others	2,632	6,396	5,866	843
Sales of equipment to:
- BJ Fastweb	1,021	—	—	—
Purchases of equipment from:
- WNT Technology	2,629	—	—	—
- DIC	1,234	—	—	—
Loan to:
- Taiji	—	—	1,500	215
- BJ Fastweb	20,000	—	—	—
Interest income from loan to:
- BJ Fastweb	210	700	700	101
Lease deposit paid to:
- Ziguang Finance Leasing	—	2,042	6,154	884
- Tuspark Harmonious	—	11,472	—	—
Lease payment paid to:
- Tuspark Harmonious	—	—	68,832	9,887
- Ziguang Finance Leasing	—	4,897	17,156	2,464

The Company had the following related party balances as of December 31, 2018 and 2019:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Amounts due from related parties:
Current:
-Marble SH (2)	—	100,106	14,379
-Shihua Investment Group (3)	—	82,542	11,856
- Xiaomi Group	41,159	39,778	5,714
-Marble Holdings (2)	—	29,736	4,271
-Shihua Investment Management (3)	—	27,905	4,008
- SH Shibei	9,800	9,800	1,408
- Taiji	13,542	9,499	1,364
-Qidi Tech	—	1,249	179
- WiFire BJ (1)	36,578	—	—
- SH Fawei (1)	13,742	—	—
- WH Fastweb (1)	5,131	—	—
- Unisvnet	1,072	—	—
- BJ Kingsoft	982	—	—
- Others	3,440	1,050	152
	125,446	301,665	43,331
Non-current:
- Tuspark Harmonious	11,472	11,863	1,704
- Ziguang Finance Leasing	2,042	8,195	1,177
- BJ Fastweb (1)	20,910	—	—
-Others	—	596	86
	34,424	20,654	2,967
Amounts due to related parties:
Current:
-Shihua Investment Group (3)	—	84,021	12,069
- Ziguang Finance Leasing	8,938	27,160	3,901
-Shihua Investment Management (3)	—	22,484	3,230
- Tuspark Harmonious	13,850	24,917	3,579
- WiFire BJ (1)	—	6,330	909
- BJ Kingsoft	609	1,073	154
- SH Guotong (1)	8,135	—	—
- CYSD (1)	7,158	—	—
- Taiji	6,724	—	—
- BZRH (1)	5,088	—	—
- Others	1,826	950	137
	52,328	166,935	23,979
Non-current:
- Tuspark Harmonious	443,622	698,511	100,335
- Ziguang Finance Leasing	12,527	47,388	6,807
- Shihua Holdings 2	48,329	—	—
	504,478	745,899	107,142

(1)

As of December 31, 2019, RMB20,367 (US$2,926) of amounts due from/to WiFire Entities were offset according to the multi-party debt offset agreement signed in 2019. The remaining RMB52,142 (US$7,490) of amounts due from WiFire Entities was fully impaired considering low collectability.

(2)

Amounts due from Marble SH and Marble Holdings represented the unpaid cash consideration to the Company for acquiring the 100% equity interest in Shihua Holdings 2’s some subsidiaries (Note 4).

(3)

Amounts due from/to Shihua Investment Management and Shihua Invesetment Group were generated from the assets acquisition of Shihua Holdings 2 (Note 4).

SEGMENT REPORTING

12 Months Ended

Dec. 31, 2019

SEGMENT REPORTING

SEGMENT REPORTING

24. SEGMENT REPORTING

As of December 31, 2016, the operations of the Company are organized into two segments, consisting of the hosting and related services and managed network services. The Company derives the results of the segments directly from its internal management reporting system. The CODM measures the performance of each segment based on metrics of revenue and earnings from operations and uses these results to evaluate the performance of, and to allocate resources to, each of the segments. After disposal of WiFire Entities and Aipu Group in September 2017 (Note 4), the Company had only one reporting segment as of December 31, 2017, 2018 and 2019.

Because substantially all of the Company’s long-lived assets and revenues are located in and derived from the PRC, geographical segments are not presented.


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Hosting and related services
Revenues	2,975,178	3,401,037	3,788,967	544,251
Cost	(2,130,279)	(2,456,166)	(2,849,518)	(409,308)
Gross profit	844,899	944,871	939,449	134,943
Operating income (expenses)
Operating income	5,439	5,027	6,862	986
Sales and marketing expenses	(171,761)	(172,176)	(206,309)	(29,634)
Research and development expenses	(97,597)	(92,109)	(88,792)	(12,754)
General and administrative expenses	(417,154)	(462,637)	(415,277)	(59,651)
(Allowance) reversal for doubtful debt	(6,257)	598	(1,557)	(224)
Impairment of receivables from equity investees	—	—	(52,142)	(7,490)
Changes in the fair value of contingent purchase consideration payables	(937)	13,905	—	—
Operating profit	156,632	237,479	182,234	26,176
Managed network services
Revenues	417,527	—	—	—
Cost	(504,016)	—	—	—
Gross loss	(86,489)	—	—	—
Operating expenses			—	—
Sales and marketing expenses	(84,921)	—	—	—
Research and development expenses	(51,546)	—	—	—
General and administrative expenses	(102,796)	—	—	—
Allowance for doubtful debt	(31,170)	—	—	—
Impairment of goodwill	(766,440)	—	—	—
Impairment of long-lived assets	(401,808)	—	—	—
Operating loss	(1,525,170)	—	—	—
Group consolidated revenue	3,392,705	3,401,037	3,788,967	544,251
Group consolidated operating (loss) profit	(1,368,538)	237,479	182,234	26,176

RESTRICTED NET ASSETS	12 Months Ended
RESTRICTED NET ASSETS	Dec. 31, 2019
RESTRICTED NET ASSETS
RESTRICTED NET ASSETS	25. RESTRICTED NET ASSETS The Company’s ability to pay dividends is primarily dependent on the Company receiving distributions of funds from its subsidiaries. Relevant PRC statutory laws and regulations permit payments of dividends by the Company’s PRC subsidiaries only out of their retained earnings, if any, as determined in accordance with PRC accounting standards and regulations. The results of operations reflected in the consolidated financial statements prepared in accordance with U.S. GAAP differ from those reflected in the statutory financial statements of the Company’s PRC subsidiaries. In accordance with the PRC Regulations on Enterprises with Foreign Investment and the articles of association of the Company’s PRC subsidiaries, a foreign-invested enterprise established in the PRC is required to provide certain statutory reserves, namely general reserve fund, the enterprise expansion fund and staff welfare and bonus fund which are appropriated from net profit as reported in the enterprise’s PRC statutory accounts. A foreign-invested enterprise is required to allocate at least 10% of its annual after-tax profit to the general reserve until such reserve has reached 50% of its respective registered capital based on the enterprise’s PRC statutory accounts. Appropriations to the enterprise expansion fund and staff welfare and bonus fund are at the discretion of the board of directors for all foreign-invested enterprises. The aforementioned reserves can only be used for specific purposes and are not distributable as cash dividends. 21Vianet China was established as a foreign-invested enterprise and, therefore, is subject to the above mandated restrictions on distributable profits. As of December 31, 2018, and 2019, the Company’s PRC subsidiaries had appropriated RMB42,403 and RMB60,469 (US$8,687), respectively, in its statutory reserves. As a result of these PRC laws and regulations subject to the limit discussed above that require annual appropriations of 10% of after-tax income to be set aside, prior to payment of dividends as general reserve fund, the Company’s PRC subsidiaries are restricted in their ability to transfer a portion of their net assets to the Company. Amounts restricted include paid-in capital, additional paid in capital and statutory reserve funds of the Company’s PRC subsidiaries and the equity of the Consolidated VIEs, as determined pursuant to PRC generally accepted accounting principles, totaling an aggregate of RMB6,736,125 (US$967,584) as of December 31, 2019.

LOSS PER SHARE

12 Months Ended

Dec. 31, 2019

LOSS PER SHARE

LOSS PER SHARE

26. LOSS PER SHARE

Basic and diluted loss per share for each of the years presented were calculated as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Numerator:
Net loss	(917,644)	(186,736)	(181,246)	(26,033)
Net loss (profit) attributable to noncontrolling interest and redeemable noncontrolling interest	144,914	(18,329)	(1,046)	(150)
Net loss attributable to ordinary shareholders	(772,730)	(205,065)	(182,292)	(26,183)
Plus increase in accretion of redeemable noncontrolling interests	(141,896)	—	—	—
Adjusted net loss attributable to ordinary shareholders	(914,626)	(205,065)	(182,292)	(26,183)


Denominator:
Weighted average number of shares outstanding—basic	672,836,226	674,732,130	668,833,756	668,833,756
Weighted average number of shares outstanding—diluted	672,836,226	674,732,130	668,833,756	668,833,756
Loss per share—Basic:
Net loss	(1.36)	(0.30)	(0.27)	(0.04)
	(1.36)	(0.30)	(0.27)	(0.04)
Loss per share—Diluted:
Net loss	(1.36)	(0.30)	(0.27)	(0.04)
	(1.36)	(0.30)	(0.27)	(0.04)

In 2017, 2018 and 2019, the Company issued 9,000,000, nil and 6,700,002 ordinary shares to its share depositary bank which will be used to settle stock option awards upon their exercise, respectively. No consideration was received by the Company for this issuance of ordinary shares. These ordinary shares are legally issued and outstanding but are treated as escrowed shares for accounting purposes and therefore, have been excluded from the computation of loss per share. Any ordinary shares not used in the settlement of stock option awards will be returned to the Company.

SHARE CAPITAL	12 Months Ended
SHARE CAPITAL	Dec. 31, 2019
SHARE CAPITAL
SHARE CAPITAL	27. SHARE CAPITAL Holders of Class A Ordinary Shares, Class B Ordinary Shares and Class C Ordinary Shares are entitled to the same rights except for voting and conversion rights. In respect of matters requiring a shareholder’s vote, each Class A Ordinary Share is entitled to one vote right, each Class B Ordinary Share is entitled to ten votes, and each Class C Ordinary Share is entitled to one vote and certain veto rights. Each Class B Ordinary Share and Class C Ordinary Share is convertible into one Class A Ordinary Share at any time by the holder. Class A Ordinary Shares are not convertible into Class B Ordinary Share and Class C Ordinary Shares under any circumstances. Upon any transfer of Class B Ordinary Shares and Class C Ordinary Shares by a holder to any person or entity which is not an affiliate of such holder, such Class B Ordinary Shares and Class C Ordinary Share will be automatically converted into an equal number of Class A Ordinary Shares. For the years ended December 31, 2017, 2018 and 2019, 3,119,052, 3,070,500 and 304,200 Class A ordinary shares were issued to settle the share options exercised and RSUs vested. In October 2019, the Company issued 60,000 newly created Class C ordinary shares to Personal Group Limited, a British Virgin Islands company wholly owned by Mr. Sheng Chen, the executive chairman of our board of directors, at a price of US$1.35 per share, to execute business strategies over the long term under the leadership of the Company’s board and senior management.

REDEEMABLE NONCONTROLLING INTERESTS

12 Months Ended

Dec. 31, 2019

REDEEMABLE NONCONTROLLING INTERESTS

REDEEMABLE NONCONTROLLING INTERESTS

28. REDEEMABLE NONCONTROLLING INTERESTS

In May 2014, the Company acquired 50% equity interests plus one share in SC Aipu. The sale and purchase agreement also provided put options that allows the seller of Aipu Group to sell the remaining 50% equity interests in the Aipu Group in three tranches, namely 28% equity interest in 2015, 11% equity interest in 2016 and the remaining equity interests (including those in 2015 and 2016 if these put options are not exercised) in 2017 for a consideration determined using certain financial or operational targets with a floor of RMB700,000 or a ceiling of RMB800,000, in aggregate. A portion of the consideration is to be settled in cash based on certain financial target stipulated in the sale and purchase agreement. The difference will be settled in cash or shares, with the choice to settle in cash or shares residing with the Company for the first tranche and the seller of Aipu Group in the subsequent tranches.

The noncontrolling interests are to be redeemed by the Company at the option of the seller of Aipu Group (“Written Put Option”) in return for cash and shares where the maximum number of shares required to be delivered is outside of the control of the Company, and thus are accounted for as redeemable noncontrolling interests. The Company elects to recognize the changes in redemption value immediately as they occur and adjust the carrying amount of the noncontrolling interests to the redemption value at the end of each reporting period as if it was the redemption date in accordance with ASC 480. As of December 31, 2015 and 2016, as the remaining 50% equity interests are held by a few non-controlling shareholders where the underlying shares of the Aipu Group are not publicly traded, the Written Put Option are embedded features in the Aipu Group’s shares, which does not qualify for bifurcation accounting. The put options are recognized as part of redeemable non-controlling interests. The redeemable noncontrolling interests were initially recorded at the higher of acquisition date fair value and subsequently adjusted to the balance after attribution of Aipu Group’s net income pursuant to ASC 810, Consolidation, and the redemption value pursuant to ASC 480, which is capped within the aforementioned range. Adjustments to the carrying amount of redeemable noncontrolling interests pursuant to ASC 480, if any, are charged to additional paid-in capital.

Upon the disposal of Aipu Group in September 2017, the redeemable noncontrolling interests recognized was reversed due to the deconsolidation of Aipu Group. However, as the Written Put Option outstanding is legally detachable separately exercisable from the 50% minus one share of equity in Aipu Group held by the Company, the Written Put Option qualifies as a freestanding financial instrument as defined under ASC Topic 480 and the Written Put Option is accounted as derivative liability pursuant to ASC 815. However, in December 2017 as part of the transfer of all the remaining 50% equity interest, the Written Put Option was terminated and the gain was recognized as part of the disposal of subsidiaries for the year ended December 31, 2017.


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Balance as of January 1	700,000	—	—	—
Loss for the year	(141,896)	—	—	—
Increase in accretion of redeemable noncontrolling interests	141,896	—	—	—
Reversal due to extinguishment of put option	(700,000)	—	—	—
Balance as of December 31	—	—	—	—

FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2019

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

29. FAIR VALUE MEASUREMENTS

The Company applies ASC 820. ASC 820 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC 820 requires disclosures to be provided on fair value measurement.

ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 — Include other inputs that are directly or indirectly observable in the marketplace.

Level 3 — Unobservable inputs which are supported by little or no market activity.

ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach; and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset.

Cash equivalents, time deposits and bonds payable are classified within Level 1 because they are valued by using quoted market prices.

The contingent considerations for the acquired businesses, liability classified RSU and long-term investments are classified within Level 3. The contingent considerations are based on the achievement of certain financial targets in accordance with the sales and purchase agreements for the various periods, as well as other non-financial measures. The fair value of liability classified RSU was estimated using the share price and exchange rate that the Company estimates to be settled in shares.

The Company measures equity investments elected to use the measurement alternative at fair value on a nonrecurring basis, in the cases of an impairment charge is recognized, fair value of an investment is remeasured in an acquisition/a disposal, and an orderly transaction for identical or similar investments of the same issuer was identified.

Assets and liabilities measured at fair value on a recurring basis were summarized below:


	Fair value measurement using:
	Quoted prices in	Significant other
	active markets for	observable	Unobservable
	identical assets	inputs	inputs	Fair value at
	(Level 1)	(Level 2)	(Level 3)	December 31, 2018
	RMB	RMB	RMB	RMB
Cash equivalents:
- Time deposits	1,194,425	—	—	1,194,425
Short-term investments:
- Time deposits	245,014	—	—	245,014
Long-term investments
- Available-for-sale debt securities	—	—	2,537	2,537
Assets	1,439,439	—	2,537	1,441,976

Long-term borrowings:
- Bonds payable	2,030,361	—	—	2,030,361
Other liabilities:
- Liability classified RSU	—	—	4,970	4,970
Liabilities	2,030,361	—	4,970	2,035,331


	Fair value measurement using:
	Quoted prices in	Significant other
	active markets for	observable	Unobservable
	identical assets	inputs	inputs	Fair value at
	(Level 1)	(Level 2)	(Level 3)	December 31, 2019
	RMB	RMB	RMB	RMB	US$
Cash equivalents:
- Time deposits	117,825	—	—	117,825	16,925
Short-term investments:
- Time deposits	363,856	—	—	363,856	52,265
Long-term investments
- Available-for-sale debt securities	—	—	1,713	1,713	246
Assets	481,681	—	1,713	483,394	69,436
Short-term borrowings:
- Current portion of bonds payable	912,416	—	—	912,416	131,060
Long-term borrowings:
- Bonds payable	2,089,114	—	—	2,089,114	300,082
Other liabilities:
- Liability classified RSU	—	—	2,109	2,109	303
Liabilities	3,001,530	—	2,109	3,003,639	431,445

The following table presented a reconciliation of all liabilities measured at fair value on a recurring basis using significant unobservable inputs (level 3):


		Contingent
		consideration
		payable
		RMB
Fair value at January 1, 2018		36,734
Changes in the fair value		(13,905)
Settlement of contingent consideration payable		(22,829)
Transfers in and/or out of Level 3		—
Fair value at December 31, 2018		—
Transfers in and/or out of Level 3		—
Fair value at December 31, 2019		—
Fair value at December 31, 2019 (US$)		—


		Liability classified
		RSU
		RMB
Fair value at January 1, 2018		11,865
Reclassification to equity		(587)
Reversal		(6,308)
Transfers in and/or out of Level 3		—
Fair value at December 31, 2018		4,970
Reclassification to equity		(2,861)
Reversal		—
Transfers in and/or out of Level 3		—
Fair value at December 31, 2019		2,109
Fair value at December 31, 2019 (US$)		303

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2019

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

30. COMMITMENTS AND CONTINGENCIES

Capital commitments

As of December 31, 2019, the Company has the following commitments to purchase certain computer and network equipment and construction-in-progress:


	RMB	US$
2020	225,511	32,393
2021 and thereafter	—	—
	225,511	32,393

Bandwidth and cabinet capacity purchase commitments

As of December 31, 2019, the Company has outstanding purchase commitments in relation to bandwidth and cabinet capacity consisting of the following:


	RMB	US$
2020	600,571	86,267
2021	60,602	8,705
2022	44,968	6,459
2023	206	30
2024 and thereafter	2,068	297
	708,415	101,758

Managed Network Services

As of December 31, 2019, the Company was still in the process of negotiation with the seller of the Managed Network Entities on the quality assessment of the fiber optic network subsequent to the completion of construction. As this is a pending event subsequent to the acquisition which is unrelated to the original acquisition, the Company concluded that the accounting for any settlement should be separated from that of the business combination. Based on the Company’s best estimate, the fair value of the related contingent consideration in shares of RMB47,755, as determined based on the remeasured amount of December 31, 2012, is accrued as a contingent payable pursuant to ASC 450, Contingencies. The Company is negotiating with the seller of the Managed Network Entities to come to an agreement on the quality assessment of the fiber optic network as of December 31, 2019 and the Company’s estimate of the contingent payable remains unchanged.

Income Taxes

As of December 31, 2019, the Company has recognized an accrual of RMB2,443 (US$351) for unrecognized tax benefits and its interest (Note 22). The final outcome of the tax uncertainty is dependent upon various matters including tax examinations, interpretation of tax laws or expiration of statutes of limitation. However, due to the uncertainties associated with the status of examinations, including the protocols of finalizing audits by the relevant tax authorities, there is a high degree of uncertainty regarding the future cash outflows associated with these tax uncertainties.

Securities Litigation

In 2014, the Company and certain of its officers and directors were named as defendants in two putative securities class actions filed in U.S. federal district courts in Texas, the complaints in both actions alleged that certain of the Company’s financial statements and other public disclosures contained misstatements or omissions and asset claims under the U.S. securities laws. In 2016, the Company filed a motion to dismiss the complaint and in 2017, the magistrate judge issued a report and recommendation to deny the Company’s motion to dismiss.

On April 9, 2018, the lead plaintiff of the putative class action filed an unopposed motion for preliminary approval of class action settlement, requesting that, among others, the Court preliminarily approve a settlement agreement that the parties reached to settle the case for RMB58,808. The unopposed motion for preliminary approval is currently pending before the Court. The Company assessed that the settlement is probable and recorded an estimated loss after deduction of insurance claim of RMB10,007 within accrued expenses and other payables in the consolidated balance sheets as of December 31, 2017. On November 9, 2018, the Court approved the settlement and issued final judgment, ending the case. The Company has paid the settlement amount as of December 31, 2018.

Operating litigation

In March 2019, a third-party supplier filed a lawsuit against the Company, alleging that the Company had not fully fulfilled its obligations under a network infrastructure cooperation agreement entered into in 2013. As this legal proceeding remains in preliminary stage, the Company’s management is unable to estimate the likelihood of an unfavorable outcome or the amount or range of any potential loss.

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2019
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	31. SUBSEQUENT EVENTS In February 2020, the Company has entered into convertible note purchase agreements with several investors to issue convertible notes for a total aggregate principal amount of US$200,000 at a simple interest rate of 2% per annum. The convertible notes will mature in five years from the date of issuance if not converted. Beginning in January 2020, the emergence and wide spread of the novel Coronavirus (“COVID-19”) has resulted in quarantines, travel restrictions, and the temporary closure of stores and facilities in China and elsewhere. Substantially all of the Company’s revenue and workforce are concentrated in China. Consequently, the COVID-19 outbreak may adversely affect the Company’s business operations, financial condition and operating results for 2020, including but not limited to negative impact to the Company’s total revenues, slower collection of accounts receivables and additional allowance for doubtful accounts and downward adjustments or impairment to the Company’s long-term investments. Because of the uncertainties surrounding the COVID-19 outbreak, the extent of the business disruption and the related financial impact cannot be reasonably estimated at this time.

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

12 Months Ended

Dec. 31, 2019

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

32. PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

Condensed balance sheets


		As of December 31,
	Notes	2018	2019
		RMB	RMB	US$
ASSETS
Current assets
Cash and cash equivalents		590,470	243,989	35,047
Short-term investments		150,990	138,848	19,944
Prepaid expenses and other current assets		98,337	105,597	15,168
Amounts due from subsidiaries	(b)	5,062,149	6,128,595	880,318
Total current assets		5,901,946	6,617,029	950,477

Non-current assets
Investments in subsidiaries		1,364,685	1,446,563	207,786
Total non-current assets		1,364,685	1,446,563	207,786
Total assets		7,266,631	8,063,592	1,158,263
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses and other payables		56,656	57,612	8,275
Account payables		2,725	56	8
Interest payable		53,965	58,525	8,406
Current portion of bonds payable		—	911,147	130,878
Amounts due to subsidiaries	(b)	21,242	22,471	3,228
Total current liabilities		134,588	1,049,811	150,795

Non-current liabilities
Bonds payable	(c)	2,037,836	2,060,708	296,002
Total non-current liabilities		2,037,836	2,060,708	296,002
Total liabilities		2,172,424	3,110,519	446,797
Shareholders’ equity:
Class A Ordinary shares (par value of US$0.00001 per share; 1,200,000,000 and 1,200,000,000 shares authorized; 499,706,628 and 505,253,850 shares issued and outstanding as of December 31, 2018 and 2019, respectively)		34	34	5
Class B Ordinary shares (par value of US$0.00001 per share; 300,000,000 and 300,000,000 shares authorized; 174,649,638 and 174,649,638 shares issued and outstanding as of December 31, 2018 and 2019, respectively)		12	12	2
Class C Ordinary shares (par value of US$0.00001 per share; nil and 60,000 shares authorized; nil and 60,000 shares issued and outstanding as of December 31, 2018 and 2019, respectively)		—	—	—
Additional paid-in capital		9,141,494	9,202,567	1,321,866
Accumulated other comprehensive income		85,979	77,904	11,190
Accumulated deficit		(3,795,629)	(3,977,921)	(571,391)
Treasury stock		(337,683)	(349,523)	(50,206)
Total shareholders’ equity		5,094,207	4,953,073	711,466
Total liabilities and shareholders’ equity		7,266,631	8,063,592	1,158,263

Condensed statements of operations


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Operating Expenses
General and administrative expenses	(145,890)	(65,949)	(44,490)	(6,389)
Changes in the fair value of contingent purchase consideration payables	(937)	13,905	—	—
Operating loss	(146,827)	(52,044)	(44,490)	(6,389)
Other loss	(95,210)	(262,186)	(274,572)	(39,440)
Share of (losses) profits from subsidiaries and Consolidated VIEs	(530,693)	109,165	136,770	19,646
Loss before income taxes	(772,730)	(205,065)	(182,292)	(26,183)
Income tax expense	—	—	—	—
Net loss	(772,730)	(205,065)	(182,292)	(26,183)

Condensed statements of comprehensive loss


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net loss	(772,730)	(205,065)	(182,292)	(26,183)
Other comprehensive (loss) income, net of tax of nil:
Foreign currency translation adjustments, net of tax of nil	(120,963)	88,652	(8,075)	(1,160)
Other comprehensive (loss) income, net of tax of nil:	(120,963)	88,652	(8,075)	(1,160)
Comprehensive loss	(893,693)	(116,413)	(190,367)	(27,343)
Comprehensive loss attributable to the Company’s ordinary shareholders	(893,693)	(116,413)	(190,367)	(27,343)

Condensed statements of cash flows


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net cash used in operating activities	(18,324)	(166,068)	(142,989)	(20,539)
Net cash used in investing activities	(1,291,042)	(203,651)	(1,011,257)	(145,258)
Net cash (used in) generated from financing activities	(130,187)	43,145	807,765	116,028
Net decrease in cash and cash equivalents and restricted cash	(1,439,533)	(326,574)	(346,481)	(49,769)
Cash and cash equivalents and restricted cash at beginning of the year	2,356,597	917,044	590,470	84,816
Cash and cash equivalents and restricted cash at end of the year	917,044	590,470	243,989	35,047

(a)

Basis of presentation

In the Company-only financial statements, the Company’s investment in subsidiaries is stated at cost plus equity in undistributed earnings of subsidiaries since inception.

The Company records its investment in its subsidiary under the equity method of accounting as prescribed in ASC 323‑10, Investment-Equity Method and Joint Ventures, and such investment is presented on the balance sheet as “Investments in subsidiaries” and the share of the subsidiaries’ profit or loss is presented as “Share of (losses) profits of subsidiaries and Consolidated VIEs” on the statements of operations.

The subsidiaries did not pay any dividends to the Company for the years presented.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted and as such, these Company-only financial statements should be read in conjunction with the Company’s consolidated financial statements.

(b) Related party transactions

The Company had the following related party balances as of December 31, 2018 and 2019:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Amounts due from subsidiaries
- 21Vianet HK	4,938,618	5,855,452	841,083
- WiFire Open Network Group Ltd.	4,277	147,326	21,162
- HongKong Fastweb Holdings Co., Ltd.	65,976	67,088	9,637
- 21V Mobile	52,579	58,018	8,334
- WiFire Group Inc.	686	698	100
- Others	13	13	2
	5,062,149	6,128,595	880,318
Amounts due to subsidiaries
- 21Vianet Beijing	18,351	19,449	2,794
- Others	2,891	3,022	434
	21,242	22,471	3,228

On April 15, 2019, the Company issued and sold bonds with an aggregate principle amount of US$300,000 at a coupon rate of 7.875% per annum (“2021 Notes”). The 2021 Notes will mature on October 15, 2021. The 2021 Notes were listed and quoted on the SGX-ST. Interest on the 2021 Notes is payable semi-annually in arrears on April 15 and October 15 in each year, beginning from October 15, 2019.

Net proceeds from 2021 Notes after deducting issuance costs were RMB1,976,474 (US$283,903). The 2021 Notes are unsecured and rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated to the bonds; equal in right of payment to any of the Company’s liabilities that are not so subordinated, including the 2020 Notes; effectively junior in the right of payment to any secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including accounts payables) of the Company’s subsidiaries and Consolidated VIEs.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Dec. 31, 2019

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of presentation

(a) Basis of presentation

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).

Principles of consolidation

(b) Principles of consolidation

Use of estimates

Foreign currency

(d) Foreign currency

Convenience translation

(e) Convenience translation

Cash and cash equivalents

(f) Cash and cash equivalents

Restricted cash

(g) Restricted cash

Short-term investments

(h) Short-term investments

All highly liquid investments with original maturities of greater than three months but less than twelve months, are classified as short-term investments. Interest income is included in earnings.

Accounts receivable and allowance for doubtful debt

(i) Accounts receivable and allowance for doubtful debt

Property and equipment

(j) Property and equipment


Category		Estimated useful life
Property		25-46 years
Leasehold improvements		Over the shorter of lease term or the estimated useful lives of the assets
Optical fibers		10-20 years
Computer and network equipment		1-10 years
Office equipment		2-8 years
Motor vehicles		2-8 years

Intangible assets

(k) Intangible assets

Intangible assets have weighted average useful lives from the date of purchase/ acquisition as follows:


Purchased software		5.1 years
Radio spectrum license		15 years
Operating permits*		31.9 years
Contract backlog*		4.9 years
Customer relationships*		8.8 years
Licenses*		15 years
Supplier relationships*		10 years
Trade Names*		20 years
Platform software*		5 years
Non-complete agreements*		5 years
Internal use software		4 years

*Acquired in the acquisitions of subsidiaries.

Leases

(l) Leases

Leases with an initial lease term of 12 months or less are not recorded on the consolidated balance sheet. Lease expense for these leases is recognized on a straight-line basis over the lease term.

Land use rights

(m) Land use right

Long-term investments

(n) Long-term investments

The Company’s long-term investments consist of equity investments without readily determinable fair value, equity method investments and available-for-sale debt investments.

Goodwill

(o) Goodwill

Impairment of long-lived assets

(p) Impairment of long-lived assets

The impairment loss reduced the carrying amount of the long-lived assets of a group on a pro-rata basis using the relative carrying amount of those assets.

The Company recorded impairment charges associated with its long-lived assets and acquired intangibles as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Impairment of equipment	237,956	—	—	—
Impairment of intangible assets	163,852	—	—	—

Fair value of financial instruments

(q) Fair value of financial instruments

The carrying amounts of bonds payable and long-term bank borrowings approximate their fair values since they bear interest rates which approximate market interest rates.

Revenue recognition

(r) Revenue recognition

The Company’s revenue recognition policies effective on the adoption date of ASC 606 are as follows:

Cost of revenues

(s) Cost of revenues

Advertising expenditures

(t) Advertising expenditures

Research and development expenses

(u) Research and development expenses

Government grants

(v) Government grants

Capitalized interest

(w) Capitalized interest

As a result of total interest costs capitalized during the period, the interest expense for the years ended December 31, 2017, 2018 and 2019, was as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Interest expense and amortization cost of bonds payable	63,354	150,098	223,832	32,151
Interest expense on bank borrowings	87,916	19,395	14,212	2,041
Interest expense on finance lease	63,757	79,935	120,185	17,263
Total interest costs	215,027	249,428	358,229	51,455
Less: Total interest costs capitalized	(29,714)	(13,362)	(12,274)	(1,762)
Interest expense, net	185,313	236,066	345,955	49,693

Income taxes

(x) Income taxes

Share-based compensation

(y) Share-based compensation

Loss per share

(z) Loss per share

Share repurchase program

(aa) Share repurchase program

For the years ended December 31, 2017, 2018 and 2019, the Company repurchased 3,448,482, nil and 242,830 ADSs for a consideration of RMB133,126, nil and RMB11,840 (US$1,701), respectively.

Comprehensive loss

(bb) Comprehensive loss

Segment reporting

(cc) Segment reporting

Employee benefits

(dd) Employee benefits

Comparatives

(ee) Comparatives

Certain items reported in the prior year’s consolidated financial statements have been reclassified to conform with the current year’s presentation.

ORGANIZATION (Tables)

12 Months Ended

Dec. 31, 2019

ORGANIZATION

Schedule of significant subsidiaries of the Company, VIEs and subsidiaries of VIEs

(a)

As of December 31, 2019, the significant subsidiaries of the Company and consolidated variable interest entities are as follows:

Entity	Date of incorporation/ acquisition	Place of incorporation	Percentage of direct ownership by the Company		Principal activities
			Direct
Subsidiaries:
21ViaNet Group Limited (“21Vianet HK”)	May 25, 2007	Hong Kong	100	%	Investment holding
21Vianet Data Center Co., Ltd. (“21Vianet China”) (1)	June 12, 2000	PRC	100	%	Provision of technical and consultation services and rental of long-lived assets
21Vianet (Foshan) Technology Co.,Ltd. (“FS Technology”) (1)	December 20, 2011	PRC	100	%	Trading of network equipment, provision of technical and internet data center services
21Vianet Anhui Suzhou Technology Co.,Ltd. (“SZ Technology”) (1)	November 16, 2011	PRC	100	%	Trading of network equipment
21Vianet Hangzhou Information Technology Co., Ltd. (“HZ Technology”) (1)	March 4, 2013	PRC	100	%	Provision of internet data center services
21Vianet Mobile Limited (“21V Mobile”)	April 30, 2013	Hong Kong	100	%	Investment holding and provision of telecommunication services
Joytone Infotech Co., Ltd. (“SZ Zhuoaiyi”) (1)	April 30, 2013	PRC	100	%	Provision of technical and consultation services
21Vianet Ventures Limited ("Ventures")	March 6, 2014	Hong Kong	100	%	Investment holding
Abitcool (China) Broadband Inc. (“aBitCool DG”) (1)	June 13, 2014	PRC	100	%	Dormant company
Diyixian.com Limited (“DYX”)	August 10, 2014	Hong Kong	100	%	Provision of virtual private network services
21Vianet Zhuhai Financial Leasing Co., Ltd. (“Zhuhai Financial Leasing”) (1)	April 9, 2015	PRC	100	%	Provision of finance leasing business services
21Vianet DRP Investment Holdings Limited (“DRP investment”)	January 10, 2017	Hong Kong	100	%	Investment holding

Entity	Date of incorporation/ acquisition	Place of incorporation	Percentage of direct ownership by the Company		Principal activities
			Direct
Shihua DC Investment Holdings Limited (“Shihua Investment”)	March 14, 2017	Cayman Islands	51	%	Investment holding
21Vianet (Xi’an) Technology Co., Ltd. (“Xi’an Tech”) (1)	July 5, 2012	PRC	51	%	Provision of technical and internet data center services
Foshan Zhuoyi Intelligence Data Co., Ltd. (“FS Zhuoyi”) (1)	July 7, 2017	PRC	51	%	Provision of internet data center services
Beijing Hongyuan Network Technology Co., Ltd. ("BJ Hongyuan") (1)	December 8, 2014	PRC	51	%	Provision of internet data center services
Dermot Holdings Limited (“Dermot BVI”) (3)	August 8, 2014	British Virgin Islands	100	%	Investment holding
Shihua DC Investment Holdings 2 Limited(“Shihua Holdings 2”) (4)	August 20, 2019	Cayman Islands	100	%	Investment holding
Shanghai Waigaoqiao Free Trade Zone Hongming Logistics Co., Ltd. (“Hongming Logistics”) (1)/(4)	August 20, 2019	PRC	100	%	Provision of internet data center services

Variable Interest Entities (the “VIEs”):
Beijing Yiyun Network Technology Co., Ltd. (“21Vianet Technology”) (1) /(2)	October 22, 2002	PRC	—		Provision of internet data center services
Beijing iJoy Information Technology Co., Ltd. (“BJ iJoy”) (1) / (2)	April 30, 2013	PRC	—		Provision of internet data center, content delivery network services
WiFire Network Technology (Beijing) Co., Ltd. (“WiFire Network”) (1) / (2)	April 1, 2014	PRC	—		Provision of telecommunication services

Held directly by 21Vianet Technology:
Beijing 21Vianet Broad Band Data Center Co., Ltd. (“21Vianet Beijing”) (1) / (2)	March 15, 2006	PRC	—		Provision of internet data center services

Held directly by 21Vianet Beijing:
21Vianet (Xi’an) Information Outsourcing Industry Park Services Co., Ltd. (“Xi’an Sub”) (1) / (2)	June 23, 2008	PRC	—		Provision of internet data center services
Langfang Xunchi Computer Data Processing Co., Ltd. (“LF Xunchi”) (1) / (2)	December 19, 2011	PRC	—		Dormant company
Shanghai Blue Cloud Technology Co., Ltd. (“SH Blue Cloud”) (1) / (2)	March 21, 2013	PRC	—		Provision of Office 365 and Windows Azure platform services
Beijing Yichengtaihe Investment Co., Ltd. (“BJ Yichengtaihe”) (1)/ (2)	September 30, 2014	PRC	—		Provision of internet data center services

Entity	Date of incorporation/ acquisition	Place of incorporation	Percentage of direct ownership by the Company		Principal activities
			Direct
Guangzhou Lianyun Big Data Co. Ltd.(1)/(2)	April 14, 2016	PRC	—		Provision of internet data center services
Beijing Xianghu Yunlian Technology Co., Ltd. (“Xianghu Yunlian”)(1)/(2)	November 7, 2018	PRC	—		Provision of internet data center services
Shanghai Hujiang Songlian Technology Co., Ltd.(“Hujiang Songlian”)(1)/(2)	December 17, 2018	PRC	—		Provision of internet data center services
Beijing Shuhai Hulian Technology Co., Ltd. (“BJ Shuhai”)(1)/(2)	January 2, 2019	PRC	—		Provision of internet data center services
Nantong Chenghong Cloud Computing Co., Ltd. (“NT Chenghong”) (1)/(2)	December 19, 2019	PRC	—		Provision of internet data center services

Held directly by DYX and LF Xunchi:
Shenzhen Diyixian Telecommunication Co., Ltd. (“SZ DYX”) (1)	August 10, 2014	PRC	100	%	Provision of virtual private network services

(1)

Collectively, the “PRC Subsidiaries”.

(2)

Collectively, the “Consolidated VIEs”.

(3)

On August 10, 2014, the Company and its subsidiary, LF Xunchi, acquired 100% equity interest of Dermot BVI and its subsidiaries (collectively referred to as “Dermot Entities”).

(4)

On August 20, 2019, the Company through its subsidiary, DRP Investment, became the sole shareholder in Shihua Holding 2 and its subsidiaries (Note 4).

Schedule of consolidated VIE before eliminating intercompany balances


	As of December 31,
	2018	2019
	RMB	RMB	US$
ASSETS
Current assets:
Cash and cash equivalents	548,921	591,503	84,964
Restricted cash	203,103	260,961	37,485
Accounts receivable (net of allowance for doubtful debt of RMB69,723 and RMB66,416 (US$9,540) as of December 31, 2018 and 2019, respectively)	375,515	513,440	73,751
Short-term investments	94,000	—	—
Prepaid expenses and other current assets	1,013,563	1,371,564	197,013
Amounts due from related parties	123,726	57,982	8,328
Total current assets	2,358,828	2,795,450	401,541
Non-current assets:
Property and equipment, net	3,103,995	3,580,341	514,284
Intangible assets, net	47,121	151,722	21,794
Land use rights, net	60,078	58,588	8,416
Operating lease right-of-use assets, net	—	1,144,846	164,447
Goodwill	302,647	302,647	43,473
Restricted cash	33,729	66,119	9,497
Deferred tax assets	156,412	180,959	25,993
Amounts due from related parties	13,514	20,654	2,967
Other non-current assets	162,392	262,685	37,732
Long-term investments	219,005	189,571	27,230
Total non-current assets	4,098,893	5,958,132	855,833
Total assets	6,457,721	8,753,582	1,257,374
Current liabilities:
Short-term bank borrowings	50,000	232,323	33,371
Accounts and notes payable	258,048	211,710	30,410
Accrued expenses and other payables	392,619	622,160	89,368
Advance from customers	670,037	1,068,692	153,508
Deferred revenue	51,026	52,088	7,482
Income tax payable	8,519	8,175	1,174
Amounts due to inter-companies (1)	2,117,097	2,786,838	400,304
Amounts due to related parties	51,763	56,977	8,184
Current portion of finance lease liabilities	219,695	220,363	31,653
Current portion of long-term bank borrowings	75,284	32,500	4,668
Deferred government grants	4,173	2,595	373
Current portion of operating lease liabilities	—	410,422	58,953
Total current liabilities	3,898,261	5,704,843	819,448


	As of December 31,
	2018	2019
	RMB	RMB	US$
Non-current liabilities:
Amounts due to inter-companies (1)	1,020,972	1,020,972	146,653
Amounts due to related parties	504,478	745,899	107,142
Long-term bank borrowings	112,000	79,500	11,419
Non-current portion of finance lease liabilities	852,287	549,669	78,955
Unrecognized tax benefits	4,938	1,991	286
Deferred tax liabilities	84,568	82,725	11,883
Deferred government grants	11,619	5,906	848
Non-current portion of operating lease liabilities	—	529,546	76,064
Total non-current liabilities	2,590,862	3,016,208	433,250
Total liabilities	6,489,123	8,721,051	1,252,698


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net revenues	2,578,893	2,532,854	2,858,176	410,551
Net (loss) profit	(567,395)	52,986	111,592	16,029


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net cash generated from operating activities	448,051	693,620	495,308	71,147
Net cash (used in) generated from investing activities	(604,507)	132,522	(1,247,764)	(179,230)
Net cash generated from (used in) financing activities	230,921	(423,467)	885,286	127,163
Net increase in cash and cash equivalents and restricted cash	74,465	402,705	132,830	19,080

(1)

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2019

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of property and equipment are depreciated using the straight-line method over the estimated useful lives of the assets


Category		Estimated useful life
Property		25-46 years
Leasehold improvements		Over the shorter of lease term or the estimated useful lives of the assets
Optical fibers		10-20 years
Computer and network equipment		1-10 years
Office equipment		2-8 years
Motor vehicles		2-8 years

Schedule of weighted average useful lives of intangible assets


Purchased software		5.1 years
Radio spectrum license		15 years
Operating permits*		31.9 years
Contract backlog*		4.9 years
Customer relationships*		8.8 years
Licenses*		15 years
Supplier relationships*		10 years
Trade Names*		20 years
Platform software*		5 years
Non-complete agreements*		5 years
Internal use software		4 years

*Acquired in the acquisitions of subsidiaries.

Schedule of impairment charges associated with long-lived assets and acquired intangibles


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Impairment of equipment	237,956	—	—	—
Impairment of intangible assets	163,852	—	—	—

Schedule of total interest expenses capitalized during the period, the interest expenses

As a result of total interest costs capitalized during the period, the interest expense for the years ended December 31, 2017, 2018 and 2019, was as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Interest expense and amortization cost of bonds payable	63,354	150,098	223,832	32,151
Interest expense on bank borrowings	87,916	19,395	14,212	2,041
Interest expense on finance lease	63,757	79,935	120,185	17,263
Total interest costs	215,027	249,428	358,229	51,455
Less: Total interest costs capitalized	(29,714)	(13,362)	(12,274)	(1,762)
Interest expense, net	185,313	236,066	345,955	49,693

ACQUISITION AND DISPOSAL OF SUBSIDIARIES (Tables)

12 Months Ended

Dec. 31, 2019

Beijing Shuhai Data Technology Co., Ltd ("BJ Shuhai")

Business Acquisition [Line Items]

Schedule of net identifiable assets of acquiree


	RMB	US$
Net assets acquired:
Operating permits (Note 9)	100,380	14,419
Cash and cash equivalents	59	8
Other current assets	9,625	1,383
Right-of-use assets	129,937	18,664
Other current liabilities	(16,714)	(2,401)
Lease liabilities	(129,937)	(18,664)
Deferred tax liabilities	(25,095)	(3,605)
Total consideration in cash	68,255	9,804

Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")

Business Acquisition [Line Items]

Schedule of net identifiable assets of acquiree


	RMB	US$
Net assets acquired:
Property and land use right	150,880	21,672
Construction-in-progress	465	67
Cash and cash equivalents	67,563	9,705
Other current assets	1,333,329	191,521
Other current liabilities	(1,203,894)	(172,929)
Deferred tax liabilities	(33,096)	(4,754)
Total consideration*	315,247	45,282

*Consideration transferred is the carrying amount of the previously held 49% of equity interest.

Nantong Chenghong Cloud Computing Co., Ltd. ("NT Chenghong")

Business Acquisition [Line Items]

Schedule of net identifiable assets of acquiree


	RMB	US$
Net assets acquired:
Construction-in-progress	158,471	22,763
Equipment	13	2
Cash and cash equivalents	129	18
Other current assets	11,840	1,701
Other current liabilities	(88,830)	(12,760)
Deferred tax liabilities	(1,623)	(233)
Total consideration in cash	80,000	11,491

ACCOUNTS AND NOTES RECEIVABLE, NET (Tables)

12 Months Ended

Dec. 31, 2019

ACCOUNTS AND NOTES RECEIVABLE, NET

Schedule of accounts and notes receivable and the allowance for doubtful debt


	As of December 31,
	2018	2019
	RMB	RMB	US$
Accounts receivable	592,669	722,840	103,830
Notes receivable	2,606	2,146	308
Allowance for doubtful debt	(70,970)	(67,828)	(9,743)
	524,305	657,158	94,395

Schedule of analysis of the allowance for doubtful debt

As of December 31, 2018 and 2019, all accounts and notes receivable were due from third party customers. An analysis of the allowance for doubtful debt was as follows:


	For the years ended December 31,
	2018	2019
	RMB	RMB	US$
Balance at beginning of the year	73,656	70,970	10,194
Additional provision charged to expense	315	485	70
Write-off of accounts receivable	(3,001)	(3,627)	(521)
Balance at the end of the year	70,970	67,828	9,743

SHORT-TERM INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2019

SHORT-TERM INVESTMENTS

Schedule of short-term investments

Short-term investments consisted of the following as of December 31, 2018 and 2019:

PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)

12 Months Ended

Dec. 31, 2019

PREPAID EXPENSES AND OTHER CURRENT ASSETS

Schedule of prepaid expenses and other current assets


	As of December 31,
	2018	2019
	RMB	RMB	US$
Prepaid expenses	565,710	878,155	126,139
Tax recoverables	421,654	570,913	82,007
Staff advances	10,730	1,866	268
Interest receivables	12,037	14,359	2,063
Deposits	39,971	17,391	2,498
Loan to third parties	58,909	73,557	10,565
Others	50,563	61,908	8,893
	1,159,574	1,618,149	232,433

PROPERTY AND EQUIPMENT, NET (Tables)

12 Months Ended

Dec. 31, 2019

PROPERTY AND EQUIPMENT, NET

Schedule of property and equipment, including those held under finance leases


	As of December 31,
	2018	2019
	RMB	RMB	US$
At cost:
Property	753,319	899,609	129,221
Leasehold improvements	932,896	1,458,749	209,536
Computer and network equipment	3,260,336	3,539,709	508,447
Optical fibers	142,723	142,723	20,501
Office equipment	24,390	22,102	3,175
Motor vehicles	1,841	2,308	331
	5,115,505	6,065,200	871,211
Less: Accumulated depreciation	(1,870,640)	(2,514,800)	(361,228)
	3,244,865	3,550,400	509,983
Construction-in-progress	786,377	1,893,165	271,936
	4,031,242	5,443,565	781,919

Schedule of depreciation expense


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Cost of revenues	458,655	520,791	644,108	92,520
Sales and marketing expenses	3,188	986	2,107	303
General and administrative expenses	41,675	28,727	30,110	4,325
Research and development expenses	19,982	15,987	20,203	2,902
	523,500	566,491	696,528	100,050

Schedule of carrying amounts of the Company's property and equipment held under finance leases


	As of December 31,
	2018	2019
	RMB	RMB	US$
Property	365,353	365,353	52,480
Computer and network equipment	719,676	639,311	91,831
Optical fibers	142,723	142,723	20,501
	1,227,752	1,147,387	164,812
Less: Accumulated depreciation	(291,579)	(408,196)	(58,634)
	936,173	739,191	106,178
Construction-in-progress	576,022	659,014	94,661
	1,512,195	1,398,205	200,839

Schedule of carrying amounts of property and equipment pledged by the Company to secure banking borrowings


	As of December 31,
	2018	2019
	RMB	RMB	US$
Property	140,393	137,585	19,763
Leasehold improvements	71,337	66,162	9,504
Computer and network equipment	74,822	—	—
Office equipment	44	—	—

INTANGIBLE ASSETS, NET (Tables)

12 Months Ended

Dec. 31, 2019

INTANGIBLE ASSETS, NET

Summary of intangible assets


		Radio									Internal
	Purchased	spectrum	Operating	Contract	Customer		Supplier	Trade	Platform	Non-compete	use
	software	license	Permits	backlog	relationships	Licenses	relationships	names	software	agreements	software	Total
	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB
Intangible assets, net January 1, 2018	50,629	77,141	—	11,750	137,882	4,268	20,144	96,404	683	154	2,060	401,115
Additions	18,744	—	—	—	—	—	—	—	—	—	6,093	24,837
Disposals	(6,772)	—	—	—	—	—	—	—	—	—	—	(6,772)
Foreign currency translation difference	364	3,884	—	—	—	—	—	—	—	—	—	4,248
Amortization expense	(15,711)	(8,117)	—	(6,588)	(24,921)	(385)	(3,074)	(5,813)	(683)	(110)	(2,713)	(68,115)
Intangible assets, net December 31, 2018	47,254	72,908	—	5,162	112,961	3,883	17,070	90,591	—	44	5,440	355,313
Additions	11,128	—	100,380	—	—	—	—	—	—	—	13,189	124,697
Foreign currency translation difference	413	1,200	—	—	—	—	—	—	—	—	—	1,613
Amortization expense	(16,068)	(8,985)	(3,136)	(5,162)	(24,921)	(385)	(3,074)	(5,813)	—	(44)	(3,440)	(71,028)
Intangible assets, net December 31, 2019	42,727	65,123	97,244	—	88,040	3,498	13,996	84,778	—	—	15,189	410,595
Intangible assets, net December 31, 2019 (US$)	6,137	9,354	13,968	—	12,646	503	2,010	12,178	—	—	2,182	58,978

Summary of annual estimated amortization expenses of intangible assets


	RMB	US$
2020	59,115	8,491
2021	55,400	7,958
2022	50,005	7,183
2023	34,274	4,923
2024	13,820	1,985
	212,614	30,540

LAND USE RIGHTS, NET (Tables)

12 Months Ended

Dec. 31, 2019

LAND USE RIGHTS, NET

Land use rights


	As of December 31,
	2018	2019
	RMB	RMB	US$
Cost	159,494	249,804	35,882
Accumulated amortization	(12,001)	(16,650)	(2,392)
Land use rights, net	147,493	233,154	33,490

Carrying value of land use rights pledged by company to secure banking borrowings

GOODWILL (Tables)

12 Months Ended

Dec. 31, 2019

GOODWILL

Schedule of Goodwill


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Balance as of January 1	1,755,970	989,530	989,530	142,137
Impairment	(766,440)	—	—	—
Balance as of December 31	989,530	989,530	989,530	142,137

LONG-TERM INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2019

LONG-TERM INVESTMENTS

Long Term Investments


	As of December 31,
	2018	2019
	RMB	RMB	US$
Equity investments without readily determinable fair values	51,410	43,824	6,295
Equity method investments	490,376	124,116	17,828
Available-for-sale debt investments	2,537	1,713	246
	544,323	169,653	24,369

Equity Method Investments

Equity method investments:


				Increase (decrease)
				during
				the year ended
	As of December 31, 2017			December 31, 2018			As of December 31, 2018
		Share	Investments					Share	Investments	Investments
	Cost of	equity	in equity	Cost of	Share	Derecognize of	Cost of	equity gain	in equity	in equity
	investments	gain (loss)	investee	investments	equity loss	share equity loss	investments	(loss)	investee	investee
	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	US$
Yizhuang Fund	101,000	176,036	277,036	—	(150,355)	—	101,000	25,681	126,681	18,425
Unis Tech	49,000	(12,961)	36,039	(49,000)	(3,548)	16,509	—	—	—	—
Shihua DC Holdings	147,176	(9,429)	137,747	219,447	(24,229)	—	366,623	(33,658)	332,965	48,428
Jingliang Inter Cloud	—	—	—	6,000	(34)	—	6,000	(34)	5,966	868
Jingliang Century Cloud	—	—	—	4,000	—	—	4,000	—	4,000	582
Huaye Cloud	—	—	—	23,333	(6,319)	—	23,333	(6,319)	17,014	2,474
ZJK Energy	—	—	—	5,907	(2,157)	—	5,907	(2,157)	3,750	545
WiFire Entities	15,000	(15,000)	—	—	—	—	15,000	(15,000)	—	—
	312,176	138,646	450,822	209,687	(186,642)	16,509	521,863	(31,487)	490,376	71,322


				Increase (decrease)
				during
				the year ended
	As of December 31, 2018			December 31, 2019			As of December 31, 2019
		Share	Investments		Share	Distribution/derecognize		Share	Investments	Investments
	Cost of	equity	in equity	Cost of	equity gain	of share	Cost of	equity gain	in equity	in equity
	investments	gain (loss)	investee	investments	(loss)	equity (gain) loss	investments	(loss)	investee	investee
	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	RMB	US$
Yizhuang Fund	101,000	25,681	126,681	—	1,671	(20,200)	101,000	7,152	108,152	15,535
Shihua DC Holdings	366,623	(33,658)	332,965	(337,555)	(17,718)	22,308	29,068	(29,068)	—	—
Jingliang Inter Cloud	6,000	(34)	5,966	—	(1,894)	—	6,000	(1,928)	4,072	585
Jingliang Century Cloud	4,000	—	4,000	—	—	—	4,000	—	4,000	575
Huaye Cloud	23,333	(6,319)	17,014	(23,333)	(11,534)	17,853	—	—	—	—
ZJK Energy	5,907	(2,157)	3,750	—	212	—	5,907	(1,945)	3,962	569
WiFire Entities	15,000	(15,000)	—	5,000	(5,000)	—	20,000	(20,000)	—	—
Qidi Chengxin	—	—	—	3,930	—	—	3,930	—	3,930	564
	521,863	(31,487)	490,376	(351,958)	(34,263)	19,961	169,905	(45,789)	124,116	17,828

BANK BORROWINGS (Tables)

12 Months Ended

Dec. 31, 2019

BANK BORROWINGS

Summary of Bank Borrowings


	As of December 31,
	2018	2019
	RMB	RMB	US$
Short-term bank borrowings	50,000	234,500	33,684
Long-term bank borrowings, current portion	75,284	32,500	4,668
	125,284	267,000	38,352
Long-term bank borrowings, non-current portion	112,000	79,500	11,419
Total bank borrowings	237,284	346,500	49,771

Secured Short Term Bank Borrowings

Bank borrowings as of December 31, 2018 and 2019 were secured by the following:


December 31, 2018
Short-term bank borrowings		Secured by
(RMB)
50,000		Secured by restricted cash of RMB60,796.
50,000

Long-term bank borrowings (including current portion)		Secured by
(RMB)
138,000		Secured by a subsidiary’s fixed assets and land-use right with net book value of RMB286,596 and RMB16,403, respectively (Note 8/Note 10).
49,284		Unsecured borrowings.
187,284


December 31, 2019
Short-term bank borrowings		Secured by
(RMB)
34,500		Unsecured borrowings.

200,000		Secured by restricted cash of RMB215,816 (US$31,000).
234,500

Long-term bank borrowings (including current portion)		Secured by
(RMB)
112,000		Secured by a subsidiary’s fixed assets and land-use right with net book value of RMB203,747 (US$29,267) and RMB15,989 (US$2,297), respectively (Note 8/Note 10).
112,000

ACCRUED EXPENSES AND OTHER PAYABLES (Tables)

12 Months Ended

Dec. 31, 2019

ACCRUED EXPENSES AND OTHER PAYABLES

Components of Accrued Expenses and Other Payables


	As of December 31,
	2018	2019
	RMB	RMB	US$
Payroll and welfare payables	224,265	179,195	25,740
Value-added tax and other taxes payable	16,931	14,523	2,086
Payables for office supplies and utilities	21,719	24,562	3,528
Payables for the purchase of property and equipment	207,512	551,759	79,255
Payables for the purchase of intangible assets	4,576	2,934	421
Accrued service fees	41,618	52,746	7,576
Interest payables	54,376	58,961	8,469
Liability classified RSU	4,970	2,109	303
Payables for acquisitions	47,755	47,805	6,867
Others	35,598	44,341	6,368
	659,320	978,935	140,613

LEASES (Tables)

12 Months Ended

Dec. 31, 2019

LEASES

Schedule of total lease cost


	For the year ended December 31,
	2019
	RMB	US$
Lease cost
Finance lease cost:
Depreciation	216,664	31,122
Interest expenses	120,185	17,263
Operating lease cost	214,795	30,853
Total lease cost	551,644	79,238

Schedule of supplemental cash flow information related to leases


	2019
	RMB	US$
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash payments for operating leases	193,174	27,748
Financing cash payments for finance leases	333,614	47,921

Schedule of future lease payments under operating leases

Future lease payments under operating leases and finance leases as of December 31, 2019 were as follows:


	Operating Leases		Finance Leases
	RMB	US$	RMB	US$
2020	466,670	67,033	364,729	52,390
2021	373,552	53,657	386,027	55,449
2022	160,644	23,075	377,564	54,234
2023	87,028	12,501	122,947	17,660
2024	47,484	6,821	121,008	17,382
2025 and thereafter	647,419	92,996	1,880,687	270,144
Total future lease payments	1,782,797	256,083	3,252,962	467,259
Less: Imputed interest	(533,376)	(76,615)	(1,563,446)	(224,575)
Present value of future lease payments *	1,249,421	179,468	1,689,516	242,684

Schedule of future lease payments under finance leases


	2019
	RMB	US$
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash payments for operating leases	193,174	27,748
Financing cash payments for finance leases	333,614	47,921

Future lease payments under operating leases and finance leases as of December 31, 2019 were as follows:


	Operating Leases		Finance Leases
	RMB	US$	RMB	US$
2020	466,670	67,033	364,729	52,390
2021	373,552	53,657	386,027	55,449
2022	160,644	23,075	377,564	54,234
2023	87,028	12,501	122,947	17,660
2024	47,484	6,821	121,008	17,382
2025 and thereafter	647,419	92,996	1,880,687	270,144
Total future lease payments	1,782,797	256,083	3,252,962	467,259
Less: Imputed interest	(533,376)	(76,615)	(1,563,446)	(224,575)
Present value of future lease payments *	1,249,421	179,468	1,689,516	242,684

BONDS PAYABLE (Tables)

12 Months Ended

Dec. 31, 2019

BONDS PAYABLE

Repayments of Principal Amounts of Long-Term Borrowings, Including Bonds Payable, Bank and Other Borrowings


	RMB	US$
For the years ending December 31,
2020	947,505	136,100
2021	2,131,860	306,223
2022	40,500	5,817
2023 and thereafter	—	—

DEFERRED GOVERNMENT GRANTS (Tables)

12 Months Ended

Dec. 31, 2019

DEFERRED GOVERNMENT GRANTS

Movements of Deferred Government Grants


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Balance at beginning of the year	30,993	22,435	15,792	2,268
Additions	2,877	500	—	—
Decrease due to disposal of subsidiaries	(3,573)	—	—	—
Recognized as a reduction of depreciation expense	(7,862)	(7,143)	(7,291)	(1,047)
Balance at end of the year	22,435	15,792	8,501	1,221

ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)

12 Months Ended

Dec. 31, 2019

ACCUMULATED OTHER COMPREHENSIVE INCOME

Changes in Accumulated Other Comprehensive Income by Component, Net of Tax of Nil


		Foreign currency
		translation
		RMB
Balance as of January 1, 2017		118,290
Current year other comprehensive income		(120,963)
Balance as of December 31, 2017		(2,673)
Current year other comprehensive loss		88,652
Balance as of December 31, 2018		85,979
Current year other comprehensive income		(8,075)
Balance as of December 31, 2019		77,904
Balance as of December 31, 2019, in US$		11,190

SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

SHARE-BASED COMPENSATION

Summary of Employee Share Option Activity Under Twenty Ten Plan


			Weighted
		Weighted	average
		average	remaining	Aggregate
	Number of	exercise	contractual	intrinsic
	options	price	term	value
		(US$)	(Years)	(US$)
Outstanding, January 1, 2019	1,479,214	0.51	2.2
Exercised	(33,869)	0.55
Outstanding, December 31, 2019	1,445,345	0.51	1.3	1,005
Vested and expected to vest at December 31, 2019	1,445,345	0.51	1.3	1,005
Exercisable as of December 31, 2019	1,445,345	0.51	1.3	1,005

Restricted Stock Units Activity


		Weighted	Weighted
		average	average	Aggregate
	Number of	grant date	remaining	intrinsic
	RSUs	fair value	contractual life	value
		(US$)	(Years)	(US$)
Unvested, January 1, 2019	3,218,452	6.66	9
Granted	544,120	7.67
Vested	(856,051)	7.22
Forfeited	(210,392)	6.52
Unvested, December 31, 2019	2,696,129	6.83	7.8	19,547

Total Compensation Expense Recognized Relating to Options Granted to Employees

Total share-based compensation expenses relating to share options and RSUs granted to employees recognized for the years ended December 31, 2017, 2018 and 2019 were as follows:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Cost of revenues	(277)	2,668	1,884	271
Sales and marketing expenses	(681)	2,139	354	51
General and administrative expenses	47,945	53,346	40,501	5,817
Research and development expenses	142	1,385	1,177	169
	47,129	59,538	43,916	6,308

TAXATION (Tables)

12 Months Ended

Dec. 31, 2019

TAXATION

Profit or Loss Before Income Taxes


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Non-PRC	(286,388)	(214,063)	(178,762)	(25,676)
PRC	(721,426)	51,738	2,953	424
	(1,007,814)	(162,325)	(175,809)	(25,252)

Income Tax (Expense) Benefits


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Current	(37,856)	(44,187)	(70,324)	(10,101)
Deferred	128,026	19,776	64,887	9,320
	90,170	(24,411)	(5,437)	(781)

Reconciliation Tax Computed Applying Statutory Income Tax Rate


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Loss before income taxes	(1,007,814)	(162,325)	(175,809)	(25,252)
Income tax benefits computed at applicable tax rates (25%)	251,954	40,581	43,952	6,313
Non-deductible expenses	(5,468)	(2,834)	(23,082)	(3,316)
Research and development expenses	11,895	25,906	19,688	2,829
Preferential rate	(90,076)	11,701	20,213	2,903
Current and deferred tax rate differences	33,366	37,934	(8,699)	(1,250)
International rate differences	59,029	(63,525)	(77,066)	(11,069)
Tax exempted income	—	—	754	108
Unrecognized tax benefits	(6,259)	1,472	1,728	248
Deferred tax expense	2,851	—	—	—
Change in valuation allowance	(174,388)	(79,694)	25,423	3,652
Prior year provision to return true up	7,266	4,048	(8,348)	(1,199)
Income tax benefits (expenses)	90,170	(24,411)	(5,437)	(781)

Significant Components of Deferred Taxes


	As of December 31,
	2018	2019
	RMB	RMB	US$
Deferred tax assets
Non-current
Allowance for doubtful debt	38,993	48,568	6,976
Accrued expenses	25,894	21,139	3,036
Tax losses	151,440	146,996	21,115
Property and equipment	15,299	20,567	2,955
Intangible assets	2,221	3,691	530
Finance lease	50,980	69,148	9,932
Deferred government grant	2,662	1,189	171
Loss picked up on equity method investments	56,616	56,706	8,145
Valuation allowance	(184,664)	(158,638)	(22,786)
Total deferred tax assets	159,441	209,366	30,074
Deferred tax liabilities
Non-current
Intangible assets	89,536	104,217	14,970
Property and equipment	48,496	81,424	11,696
Capitalized interest expense	15,837	15,146	2,176
Gain picked up from equity method investments	3,851	1,785	256
Total non-current deferred tax liabilities	157,720	202,572	29,098

Unrecognized Tax Benefits


	For the years ended December 31,
	2018	2019
	RMB	RMB	US$
Balance at beginning of year	11,582	4,509	647
Reversal based on tax positions related to prior years	(9,070)	(3,266)	(469)
Additions based on tax positions related to the current year	1,997	479	69
Balance at end of year	4,509	1,722	247

RELATED PARTY TRANSACTIONS (Tables)

12 Months Ended

Dec. 31, 2019

Related Party Transactions

Other than disclosed elsewhere, the Company had the following significant related party transactions for the years ended December 31, 2017, 2018 and 2019:


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Services provided to:
- Xiaomi Group	220,110	374,085	437,694	62,871
- Taiji	—	13,681	7,899	1,135
- Qidi Tech	—	—	7,427	1,067
- BJ Kingsoft	8,046	6,281	3,475	499
- WiFire BJ	9,726	16,490	1,934	278
- BJ Cheetah	5,128	2,079	169	24
- Unisvnet	—	1,011	—	—
- Others	3,314	4,493	1,494	215
Services provided by:
- CYSD	2,979	18,667	38,918	5,590
- Taiji	—	7,095	19,942	2,865
- Jingliang Inter Cloud	—	3,477	8,829	1,268
- BJ Kingsoft	7,775	13,204	3,492	502
- DCSS	6,424	5,238	—	—
- BZRH	—	4,239	—	—
- WiFire BJ	1,616	4,066	—	—
- Others	2,632	6,396	5,866	843
Sales of equipment to:
- BJ Fastweb	1,021	—	—	—
Purchases of equipment from:
- WNT Technology	2,629	—	—	—
- DIC	1,234	—	—	—
Loan to:
- Taiji	—	—	1,500	215
- BJ Fastweb	20,000	—	—	—
Interest income from loan to:
- BJ Fastweb	210	700	700	101
Lease deposit paid to:
- Ziguang Finance Leasing	—	2,042	6,154	884
- Tuspark Harmonious	—	11,472	—	—
Lease payment paid to:
- Tuspark Harmonious	—	—	68,832	9,887
- Ziguang Finance Leasing	—	4,897	17,156	2,464

Related Party Balances


	As of December 31,
	2018	2019
	RMB	RMB	US$
Amounts due from related parties:
Current:
-Marble SH (2)	—	100,106	14,379
-Shihua Investment Group (3)	—	82,542	11,856
- Xiaomi Group	41,159	39,778	5,714
-Marble Holdings (2)	—	29,736	4,271
-Shihua Investment Management (3)	—	27,905	4,008
- SH Shibei	9,800	9,800	1,408
- Taiji	13,542	9,499	1,364
-Qidi Tech	—	1,249	179
- WiFire BJ (1)	36,578	—	—
- SH Fawei (1)	13,742	—	—
- WH Fastweb (1)	5,131	—	—
- Unisvnet	1,072	—	—
- BJ Kingsoft	982	—	—
- Others	3,440	1,050	152
	125,446	301,665	43,331
Non-current:
- Tuspark Harmonious	11,472	11,863	1,704
- Ziguang Finance Leasing	2,042	8,195	1,177
- BJ Fastweb (1)	20,910	—	—
-Others	—	596	86
	34,424	20,654	2,967
Amounts due to related parties:
Current:
-Shihua Investment Group (3)	—	84,021	12,069
- Ziguang Finance Leasing	8,938	27,160	3,901
-Shihua Investment Management (3)	—	22,484	3,230
- Tuspark Harmonious	13,850	24,917	3,579
- WiFire BJ (1)	—	6,330	909
- BJ Kingsoft	609	1,073	154
- SH Guotong (1)	8,135	—	—
- CYSD (1)	7,158	—	—
- Taiji	6,724	—	—
- BZRH (1)	5,088	—	—
- Others	1,826	950	137
	52,328	166,935	23,979
Non-current:
- Tuspark Harmonious	443,622	698,511	100,335
- Ziguang Finance Leasing	12,527	47,388	6,807
- Shihua Holdings 2	48,329	—	—
	504,478	745,899	107,142

(1)

(2)

Amounts due from Marble SH and Marble Holdings represented the unpaid cash consideration to the Company for acquiring the 100% equity interest in Shihua Holdings 2’s some subsidiaries (Note 4).

(3)

Amounts due from/to Shihua Investment Management and Shihua Invesetment Group were generated from the assets acquisition of Shihua Holdings 2 (Note 4).

Parent Company

Related Party Transactions

The Company had the following related party balances as of December 31, 2018 and 2019:


	As of December 31,
	2018	2019
	RMB	RMB	US$
Amounts due from subsidiaries
- 21Vianet HK	4,938,618	5,855,452	841,083
- WiFire Open Network Group Ltd.	4,277	147,326	21,162
- HongKong Fastweb Holdings Co., Ltd.	65,976	67,088	9,637
- 21V Mobile	52,579	58,018	8,334
- WiFire Group Inc.	686	698	100
- Others	13	13	2
	5,062,149	6,128,595	880,318
Amounts due to subsidiaries
- 21Vianet Beijing	18,351	19,449	2,794
- Others	2,891	3,022	434
	21,242	22,471	3,228

SEGMENT REPORTING (Tables)

12 Months Ended

Dec. 31, 2019

SEGMENT REPORTING

Summary of Segment Results


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Hosting and related services
Revenues	2,975,178	3,401,037	3,788,967	544,251
Cost	(2,130,279)	(2,456,166)	(2,849,518)	(409,308)
Gross profit	844,899	944,871	939,449	134,943
Operating income (expenses)
Operating income	5,439	5,027	6,862	986
Sales and marketing expenses	(171,761)	(172,176)	(206,309)	(29,634)
Research and development expenses	(97,597)	(92,109)	(88,792)	(12,754)
General and administrative expenses	(417,154)	(462,637)	(415,277)	(59,651)
(Allowance) reversal for doubtful debt	(6,257)	598	(1,557)	(224)
Impairment of receivables from equity investees	—	—	(52,142)	(7,490)
Changes in the fair value of contingent purchase consideration payables	(937)	13,905	—	—
Operating profit	156,632	237,479	182,234	26,176
Managed network services
Revenues	417,527	—	—	—
Cost	(504,016)	—	—	—
Gross loss	(86,489)	—	—	—
Operating expenses			—	—
Sales and marketing expenses	(84,921)	—	—	—
Research and development expenses	(51,546)	—	—	—
General and administrative expenses	(102,796)	—	—	—
Allowance for doubtful debt	(31,170)	—	—	—
Impairment of goodwill	(766,440)	—	—	—
Impairment of long-lived assets	(401,808)	—	—	—
Operating loss	(1,525,170)	—	—	—
Group consolidated revenue	3,392,705	3,401,037	3,788,967	544,251
Group consolidated operating (loss) profit	(1,368,538)	237,479	182,234	26,176

LOSS PER SHARE (Tables)

12 Months Ended

Dec. 31, 2019

LOSS PER SHARE

Basic and Diluted Loss Per Share


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Numerator:
Net loss	(917,644)	(186,736)	(181,246)	(26,033)
Net loss (profit) attributable to noncontrolling interest and redeemable noncontrolling interest	144,914	(18,329)	(1,046)	(150)
Net loss attributable to ordinary shareholders	(772,730)	(205,065)	(182,292)	(26,183)
Plus increase in accretion of redeemable noncontrolling interests	(141,896)	—	—	—
Adjusted net loss attributable to ordinary shareholders	(914,626)	(205,065)	(182,292)	(26,183)


Denominator:
Weighted average number of shares outstanding—basic	672,836,226	674,732,130	668,833,756	668,833,756
Weighted average number of shares outstanding—diluted	672,836,226	674,732,130	668,833,756	668,833,756
Loss per share—Basic:
Net loss	(1.36)	(0.30)	(0.27)	(0.04)
	(1.36)	(0.30)	(0.27)	(0.04)
Loss per share—Diluted:
Net loss	(1.36)	(0.30)	(0.27)	(0.04)
	(1.36)	(0.30)	(0.27)	(0.04)

REDEEMABLE NONCONTROLLING INTERESTS (Tables)

12 Months Ended

Dec. 31, 2019

REDEEMABLE NONCONTROLLING INTERESTS

Redeemable Non Controlling Interests


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Balance as of January 1	700,000	—	—	—
Loss for the year	(141,896)	—	—	—
Increase in accretion of redeemable noncontrolling interests	141,896	—	—	—
Reversal due to extinguishment of put option	(700,000)	—	—	—
Balance as of December 31	—	—	—	—

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2019

FAIR VALUE MEASUREMENTS

Assets and Liabilities Measured at Fair Value on Recurring Basis


	Fair value measurement using:
	Quoted prices in	Significant other
	active markets for	observable	Unobservable
	identical assets	inputs	inputs	Fair value at
	(Level 1)	(Level 2)	(Level 3)	December 31, 2018
	RMB	RMB	RMB	RMB
Cash equivalents:
- Time deposits	1,194,425	—	—	1,194,425
Short-term investments:
- Time deposits	245,014	—	—	245,014
Long-term investments
- Available-for-sale debt securities	—	—	2,537	2,537
Assets	1,439,439	—	2,537	1,441,976

Long-term borrowings:
- Bonds payable	2,030,361	—	—	2,030,361
Other liabilities:
- Liability classified RSU	—	—	4,970	4,970
Liabilities	2,030,361	—	4,970	2,035,331


	Fair value measurement using:
	Quoted prices in	Significant other
	active markets for	observable	Unobservable
	identical assets	inputs	inputs	Fair value at
	(Level 1)	(Level 2)	(Level 3)	December 31, 2019
	RMB	RMB	RMB	RMB	US$
Cash equivalents:
- Time deposits	117,825	—	—	117,825	16,925
Short-term investments:
- Time deposits	363,856	—	—	363,856	52,265
Long-term investments
- Available-for-sale debt securities	—	—	1,713	1,713	246
Assets	481,681	—	1,713	483,394	69,436
Short-term borrowings:
- Current portion of bonds payable	912,416	—	—	912,416	131,060
Long-term borrowings:
- Bonds payable	2,089,114	—	—	2,089,114	300,082
Other liabilities:
- Liability classified RSU	—	—	2,109	2,109	303
Liabilities	3,001,530	—	2,109	3,003,639	431,445

Reconciliation of Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs Level Three


		Contingent
		consideration
		payable
		RMB
Fair value at January 1, 2018		36,734
Changes in the fair value		(13,905)
Settlement of contingent consideration payable		(22,829)
Transfers in and/or out of Level 3		—
Fair value at December 31, 2018		—
Transfers in and/or out of Level 3		—
Fair value at December 31, 2019		—
Fair value at December 31, 2019 (US$)		—


		Liability classified
		RSU
		RMB
Fair value at January 1, 2018		11,865
Reclassification to equity		(587)
Reversal		(6,308)
Transfers in and/or out of Level 3		—
Fair value at December 31, 2018		4,970
Reclassification to equity		(2,861)
Reversal		—
Transfers in and/or out of Level 3		—
Fair value at December 31, 2019		2,109
Fair value at December 31, 2019 (US$)		303

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2019

Computer and Network Equipment and Construction in Progress

Purchase Commitments

As of December 31, 2019, the Company has the following commitments to purchase certain computer and network equipment and construction-in-progress:


	RMB	US$
2020	225,511	32,393
2021 and thereafter	—	—
	225,511	32,393

Bandwidth and Cabinet Capacity

Purchase Commitments

As of December 31, 2019, the Company has outstanding purchase commitments in relation to bandwidth and cabinet capacity consisting of the following:


	RMB	US$
2020	600,571	86,267
2021	60,602	8,705
2022	44,968	6,459
2023	206	30
2024 and thereafter	2,068	297
	708,415	101,758

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Tables)

12 Months Ended

Dec. 31, 2019

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

Condensed Balance Sheets

Condensed balance sheets


		As of December 31,
	Notes	2018	2019
		RMB	RMB	US$
ASSETS
Current assets
Cash and cash equivalents		590,470	243,989	35,047
Short-term investments		150,990	138,848	19,944
Prepaid expenses and other current assets		98,337	105,597	15,168
Amounts due from subsidiaries	(b)	5,062,149	6,128,595	880,318
Total current assets		5,901,946	6,617,029	950,477

Non-current assets
Investments in subsidiaries		1,364,685	1,446,563	207,786
Total non-current assets		1,364,685	1,446,563	207,786
Total assets		7,266,631	8,063,592	1,158,263
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses and other payables		56,656	57,612	8,275
Account payables		2,725	56	8
Interest payable		53,965	58,525	8,406
Current portion of bonds payable		—	911,147	130,878
Amounts due to subsidiaries	(b)	21,242	22,471	3,228
Total current liabilities		134,588	1,049,811	150,795

Non-current liabilities
Bonds payable	(c)	2,037,836	2,060,708	296,002
Total non-current liabilities		2,037,836	2,060,708	296,002
Total liabilities		2,172,424	3,110,519	446,797
Shareholders’ equity:
Class A Ordinary shares (par value of US$0.00001 per share; 1,200,000,000 and 1,200,000,000 shares authorized; 499,706,628 and 505,253,850 shares issued and outstanding as of December 31, 2018 and 2019, respectively)		34	34	5
Class B Ordinary shares (par value of US$0.00001 per share; 300,000,000 and 300,000,000 shares authorized; 174,649,638 and 174,649,638 shares issued and outstanding as of December 31, 2018 and 2019, respectively)		12	12	2
Class C Ordinary shares (par value of US$0.00001 per share; nil and 60,000 shares authorized; nil and 60,000 shares issued and outstanding as of December 31, 2018 and 2019, respectively)		—	—	—
Additional paid-in capital		9,141,494	9,202,567	1,321,866
Accumulated other comprehensive income		85,979	77,904	11,190
Accumulated deficit		(3,795,629)	(3,977,921)	(571,391)
Treasury stock		(337,683)	(349,523)	(50,206)
Total shareholders’ equity		5,094,207	4,953,073	711,466
Total liabilities and shareholders’ equity		7,266,631	8,063,592	1,158,263

Condensed Statements of Operations

Condensed statements of operations


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Operating Expenses
General and administrative expenses	(145,890)	(65,949)	(44,490)	(6,389)
Changes in the fair value of contingent purchase consideration payables	(937)	13,905	—	—
Operating loss	(146,827)	(52,044)	(44,490)	(6,389)
Other loss	(95,210)	(262,186)	(274,572)	(39,440)
Share of (losses) profits from subsidiaries and Consolidated VIEs	(530,693)	109,165	136,770	19,646
Loss before income taxes	(772,730)	(205,065)	(182,292)	(26,183)
Income tax expense	—	—	—	—
Net loss	(772,730)	(205,065)	(182,292)	(26,183)

Condensed Statements of Comprehensive Loss

Condensed statements of comprehensive loss


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net loss	(772,730)	(205,065)	(182,292)	(26,183)
Other comprehensive (loss) income, net of tax of nil:
Foreign currency translation adjustments, net of tax of nil	(120,963)	88,652	(8,075)	(1,160)
Other comprehensive (loss) income, net of tax of nil:	(120,963)	88,652	(8,075)	(1,160)
Comprehensive loss	(893,693)	(116,413)	(190,367)	(27,343)
Comprehensive loss attributable to the Company’s ordinary shareholders	(893,693)	(116,413)	(190,367)	(27,343)

Condensed Statements of Cash Flows

Condensed statements of cash flows


	For the years ended December 31,
	2017	2018	2019
	RMB	RMB	RMB	US$
Net cash used in operating activities	(18,324)	(166,068)	(142,989)	(20,539)
Net cash used in investing activities	(1,291,042)	(203,651)	(1,011,257)	(145,258)
Net cash (used in) generated from financing activities	(130,187)	43,145	807,765	116,028
Net decrease in cash and cash equivalents and restricted cash	(1,439,533)	(326,574)	(346,481)	(49,769)
Cash and cash equivalents and restricted cash at beginning of the year	2,356,597	917,044	590,470	84,816
Cash and cash equivalents and restricted cash at end of the year	917,044	590,470	243,989	35,047

ORGANIZATION - Significant subsidiaries of the Company and consolidated variable interest entities (Details) - Subsidiaries	12 Months Ended
	Dec. 31, 2019
21ViaNet Group Limited ("21Vianet HK")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet Data Center Co., Ltd. ("21Vianet China")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet (Foshan) Technology Co., Ltd. ("FS Technology")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet Anhui Suzhou Technology Co., Ltd.("SZ Technology")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet Hangzhou Information Technology Co.,Ltd. ("HZ Technology")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet Mobile Limited ("21V Mobile")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
Joytone Infotech Co., Ltd. ("SZ Zhuoaiyi")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet Ventures Limited (Ventures)
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
Abitcool (China) Broadband Inc. ("aBitCool DG")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
Diyixian.com Limited ("Diyixian.com")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet Zhuhai Financial Leasing Limited
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
21Vianet DRP Investment Holdings Limited [Member]
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
Shihua DC Investment Holdings Limited.
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	51.00%
21Vianet (Xi'an) Technology Co., Ltd. ("Xi'an Tech")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	51.00%
Foshan Zhuoyi Intelligence Date Co., Ltd. ("FS Zhuoyi")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	51.00%
Dermot Holding Limited [Member]
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
Beijing Hongyuan Network Technology Co., Ltd [Member]
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	51.00%
Shenzhen Diyixian Telecommunication Co., Ltd [Member]
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%
Shanghai Waigaoqiao Free Trade Zone Hongming Logistics Co., Ltd. ("Hongming Logistics")
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of direct ownership by the Company	100.00%

ORGANIZATION - Significant subsidiaries of the Company and consolidated variable interest entities (Parenthetical) (Details)	Aug. 10, 2014
Dermot Entities
Significant subsidiaries of the Company, VIEs and subsidiaries of VIEs
Percentage of equity interests acquired	100.00%

ORGANIZATION - Additional Information (Details) $ in Thousands				1 Months Ended		12 Months Ended
	Aug. 20, 2019	Dec. 19, 2016	Jan. 31, 2011 CNY (¥)	Aug. 31, 2019	Mar. 31, 2017 item	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 USD ($) entity	Dec. 31, 2019 CNY (¥) entity	Dec. 31, 2018	Mar. 14, 2017
Organization
Number of additional VIEs controlled through Primary Beneficiaries \| entity							2	2
Assets pledged as collateral							$ 31,564	¥ 219,736,000
Consolidated VIE's assets pledged as collateral								0
Consolidated VIE's liabilities pledged as collateral								¥ 0
Internet Data Center Services
Organization
Equity interest percentage by parent					51.00%					51.00%
Number of internet data centers \| item					4
Warburg Pincus
Organization
Equity interest percentage by parent					49.00%					49.00%
Equity interest percentage					49.00%				49.00%
Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2") \| Warburg Pincus
Organization
Percentage of equity interest transferred	100.00%			100.00%
Option Agreement
Organization
Exclusive option price						¥ 1
Agreement agreement between 21Vianet China and the 21Vianet Technology, term		10 years				10 years
Agreement agreement between 21Vianet China and the 21Vianet Technology, expiration date		Dec. 18, 2026				Dec. 18, 2016
Technical Consulting and Service Agreement
Organization
Agreement agreement between 21Vianet China and the 21Vianet Technology, term		10 years				10 years
Agreement agreement between 21Vianet China and the 21Vianet Technology, expiration date		Dec. 18, 2026				Dec. 18, 2016
Service fee per hour						¥ 1,000
Loan Agreement \| Shareholders \| Loan one
Organization
Loan facility provided to related parties			¥ 7,000,000
Loan Agreement \| Shareholders \| Loan Two
Organization
Loan facility provided to related parties			¥ 3,000,000

ORGANIZATION - Financial information of the consolidated VIEs (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2016 CNY (¥)
Current assets:
Cash and cash equivalents	$ 259,772			¥ 1,949,631	¥ 1,808,483		¥ 2,358,556
Restricted cash	68,786			242,494	478,873		265,214
Short-term investments	52,265				363,856		245,014
Prepaid expenses and other current assets	232,433				1,618,149		1,159,574
Amounts due from related parties	43,331				301,665		125,446
Total current assets	750,982				5,228,184		4,678,109
Non-current assets:
Property and equipment, net	781,919				5,443,565		4,031,242
Intangible assets, net	58,978			401,115	410,595		355,313
Land use rights, net	33,490				233,154		147,493
Operating lease right-of-use assets, net	175,474				1,221,616
Goodwill	142,137			989,530	989,530	$ 142,137	989,530	¥ 1,755,970
Restricted cash	10,029			3,344	69,821		37,251
Deferred tax assets	30,074				209,366		159,441
Amounts due from related parties	2,967				20,654		34,424
Other non-current assets	39,870				277,568		173,591
Long-term investments	24,369				169,653		544,323
Total non-current assets	1,299,307				9,045,522		6,472,608
Total assets	2,050,289				14,273,706		11,150,717
Current liabilities:
Short-term bank borrowings	33,684				234,500		50,000
Accounts and notes payable	43,542				303,128		389,508
Accrued expenses and other payables	140,613				978,935		659,320
Advance from customers	153,508				1,068,692		670,037
Deferred revenue	8,277				57,625		57,754
Income tax payable	6,899				48,032		13,111
Amounts due to related parties	23,979				166,935		52,328
Current portion of finance lease liabilities	32,623				227,115		219,695
Current portion of long-term bank borrowings	4,668				32,500		75,284
Deferred government grants	373				2,595		4,173
Current portion of operating lease liabilities	62,888				437,817
Total current liabilities	641,932				4,469,021		2,191,210
Non-current liabilities:
Amounts due to related parties-non current	107,142				745,899		504,478
Non-current portion of finance lease liabilities	128,836				896,927		765,993
Unrecognized tax benefits	351				2,443		6,677
Deferred tax liabilities	29,098				202,572		157,720
Deferred government grants	848				5,906		11,619
Non-current portion of operating lease liabilities	83,183				579,102
Total non-current liabilities	656,879				4,573,057		3,596,323
Total liabilities	1,298,811				9,042,078		5,787,533
Revenues	544,251	¥ 3,788,967	¥ 3,401,037	3,392,705
Net (loss) profit	(26,033)	(181,246)	(186,736)	(917,644)
Net cash generated from operating activities	115,332	802,922	704,966	487,202
Net cash (used in) generated from investing activities	(231,550)	(1,611,983)	(304,846)	(833,307)
Net cash generated from (used in) financing activities	66,302	461,557	(19,901)	(612,651)
Variable Interest Entity, Primary Beneficiary
Current assets:
Cash and cash equivalents	84,964				591,503		548,921
Restricted cash	37,485				260,961		203,103
Accounts receivable (net of allowance for doubtful debt of RMB69,723 and RMB66,416 (US$9,540) as of December 31, 2018 and 2019, respectively)	73,751				513,440		375,515
Short-term investments							94,000
Prepaid expenses and other current assets	197,013				1,371,564		1,013,563
Amounts due from related parties	8,328				57,982		123,726
Total current assets	401,541				2,795,450		2,358,828
Non-current assets:
Property and equipment, net	514,284				3,580,341		3,103,995
Intangible assets, net	21,794				151,722		47,121
Land use rights, net	8,416				58,588		60,078
Operating lease right-of-use assets, net	164,447				1,144,846
Goodwill	43,473				302,647		302,647
Restricted cash	9,497				66,119		33,729
Deferred tax assets	25,993				180,959		156,412
Amounts due from related parties	2,967				20,654		13,514
Other non-current assets	37,732				262,685		162,392
Long-term investments	27,230				189,571		219,005
Total non-current assets	855,833				5,958,132		4,098,893
Total assets	1,257,374				8,753,582		6,457,721
Current liabilities:
Short-term bank borrowings	33,371				232,323		50,000
Accounts and notes payable	30,410				211,710		258,048
Accrued expenses and other payables	89,368				622,160		392,619
Advance from customers	153,508				1,068,692		670,037
Deferred revenue	7,482				52,088		51,026
Income tax payable	1,174				8,175		8,519
Amounts due to inter-companies	400,304				2,786,838		2,117,097
Amounts due to related parties	8,184				56,977		51,763
Current portion of finance lease liabilities	31,653				220,363		219,695
Current portion of long-term bank borrowings	4,668				32,500		75,284
Deferred government grants	373				2,595		4,173
Current portion of operating lease liabilities	58,953				410,422		0
Total current liabilities	819,448				5,704,843		3,898,261
Non-current liabilities:
Amounts due to inter-companies	146,653				1,020,972		1,020,972
Amounts due to related parties-non current	107,142				745,899		504,478
Long-term bank borrowings	11,419				79,500		112,000
Non-current portion of finance lease liabilities	78,955				549,669		852,287
Unrecognized tax benefits	286				1,991		4,938
Deferred tax liabilities	11,883				82,725		84,568
Deferred government grants	848				5,906		11,619
Non-current portion of operating lease liabilities	76,064				529,546		0
Total non-current liabilities	433,250				3,016,208		2,590,862
Total liabilities	1,252,698				¥ 8,721,051		¥ 6,489,123
Revenues	410,551	2,858,176	2,532,854	2,578,893
Net (loss) profit	16,029	111,592	52,986	(567,395)
Net cash generated from operating activities	71,147	495,308	693,620	448,051
Net cash (used in) generated from investing activities	(179,230)	(1,247,764)	132,522	(604,507)
Net cash generated from (used in) financing activities	127,163	885,286	(423,467)	230,921
Net increase in cash and cash equivalents and restricted cash	$ 19,080	¥ 132,830	¥ 402,705	¥ 74,465

ORGANIZATION - Financial information of the consolidated VIEs (Parenthetical) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity
Accounts receivable, allowance for doubtful accounts	$ 9,540	¥ 66,416	¥ 69,723

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Estimated useful lives of property and equipment (Details)	12 Months Ended
	Dec. 31, 2019
Property \| Minimum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	25 years
Property \| Maximum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	46 years
Optical Fibers \| Minimum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	10 years
Optical Fibers \| Maximum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	20 years
Computer and network equipment \| Minimum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	1 year
Computer and network equipment \| Maximum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	10 years
Office equipment \| Minimum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	2 years
Office equipment \| Maximum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	8 years
Motor vehicles \| Minimum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	2 years
Motor vehicles \| Maximum
PROPERTY AND EQUIPMENT, NET
Property and equipment, estimated useful life (in years)	8 years

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted average useful lives of intangible assets (Details)	12 Months Ended
	Dec. 31, 2019
Purchased software
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	5 years 1 month 6 days
Radio Spectrum License
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	15 years
Operating permits
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	31 years 10 months 24 days
Contract Backlog
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	4 years 10 months 24 days
Customer Relationships
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	8 years 9 months 18 days
Licenses
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	15 years
Supplier Relationships
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	10 years
Trade Names
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	20 years
Platform Software
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	5 years
Non-compete agreement
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	5 years
Internal-use Software
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	4 years

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment charges associated with its long-lived assets and acquired intangibles (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Impairment of equipment	¥ 237,956
Impairment of intangible assets	¥ 163,852

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Interest expenses (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Interest expense and amortization cost of bonds payable	$ 32,151	¥ 223,832	¥ 150,098	¥ 63,354
Interest expense on bank borrowings	2,041	14,212	19,395	87,916
Interest expense on finance lease	17,263	120,185	79,935	63,757
Total interest costs	51,455	358,229	249,428	215,027
Less: Total interest costs capitalized	(1,762)	(12,274)	(13,362)	(29,714)
Interest expenses, net	$ 49,693	¥ 345,955	¥ 236,066	¥ 185,313

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) ¥ in Thousands, $ in Thousands					1 Months Ended	12 Months Ended
	Dec. 02, 2019 USD ($)	Jan. 01, 2019	Aug. 31, 2017 item	Sep. 30, 2016 segment	Sep. 30, 2017	Dec. 31, 2019 USD ($) item shares	Dec. 31, 2019 CNY (¥) item shares	Dec. 31, 2018 USD ($) item shares	Dec. 31, 2018 CNY (¥) item shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2019 CNY (¥)
Significant accounting policies
Internal use software development costs, Amount capitalized						$ 1,894			¥ 6,093	¥ 9,238	¥ 13,189
Lease, Practical Expedients, Package		true
Percentage of interest in limited partnerships applies the equity method of accounting						3.00%	3.00%
Number of reporting units \| item			2			1	1	1	1
Number of service lines \| item			2
Cash flows estimated growth rate after six years using terminal value					3.00%
Discount rate used in the valuations based on weighted average cost of capital					13.00%
Discounted cash flow projection period					5 years	5 years	5 years
Impairment losses pursuant to the goodwill tests										766,440
Impairment losses of long-lived assets							¥ 0		¥ 0	401,808
Deferred revenue						$ 8,277			57,754		¥ 57,625
Revenue recognized						6,751	46,996
Advertising expense						$ 875	¥ 6,095		¥ 7,968	¥ 7,773
Share repurchase plan, shares repurchased (in shares) \| shares						242,830	242,830	0	0	3,448,482
Share Repurchase Plan, share value							¥ 11,840			¥ 133,126
Number of reportable segments \| segment				2
Aipu Group
Significant accounting policies
Discounted cash flow projection period						7 years	7 years
Impairment losses of long-lived assets						$ 0				170,695
WiFire Group Inc. ("WiFire Group")
Significant accounting policies
Discounted cash flow projection period						5 years	5 years
Impairment losses of long-lived assets										¥ 231,113
Hosting and related services
Significant accounting policies
Impairment losses pursuant to the goodwill tests \| $						$ 0		$ 0
American Depository Shares
Significant accounting policies
Share Repurchase Plan, period	13 months
Share repurchase plan, shares repurchased (in shares) \| shares						242,830	242,830	0	0	3,448,482
Share Repurchase Plan, share value						$ 1,701	¥ 11,840		¥ 0	¥ 133,126
Maximum
Significant accounting policies
Official exchange rate of foreign currency remeasured (RMB per one U.S. dollar)						6.9618					6.9618
Maximum \| American Depository Shares
Significant accounting policies
Share Repurchase Plan, value \| $	$ 20,000

CONCENTRATION OF RISKS (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) customer item	Dec. 31, 2018 USD ($) customer item	Dec. 31, 2017 customer item	Dec. 31, 2019 CNY (¥) item	Dec. 31, 2018 CNY (¥) item
CONCENTRATION OF RISKS
Depreciation of RMB against US$	1.60%	5.00%	(5.80%)
Customer Concentration Risk
CONCENTRATION OF RISKS
Number of customers who contributed more than 3% of Company's revenue \| customer	0	0	0
Cabinet and Bandwidth Supply
CONCENTRATION OF RISKS
Number of suppliers \| item	5	5	5	5	5
Cabinet and Bandwidth Supply \| Supplier Concentration Risk
CONCENTRATION OF RISKS
Concentration of risk, percentage	21.00%	19.00%	21.00%
Bandwidth and Cabinet Resources \| Customer Concentration Risk
CONCENTRATION OF RISKS
Concentration of risk, percentage	4.00%	4.00%	2.00%
Bandwidth and Cabinet Resources \| Customer Concentration Risk \| Largest single customer \| Maximum
CONCENTRATION OF RISKS
Concentration of risk, percentage	8.00%
PRC \| Credit Concentration Risk
CONCENTRATION OF RISKS
Cash and cash equivalents, restricted cash and short-term investments, held at major institutions	$ 168,214			¥ 1,171,075	¥ 1,131,588
Outside the PRC \| Credit Concentration Risk
CONCENTRATION OF RISKS
Cash and cash equivalents, restricted cash and short-term investments, held at major institutions	$ 222,638	$ 258,083		¥ 1,549,958

ACQUISITION AND DISPOSAL OF SUBSIDIARIES (Details) ¥ in Thousands, $ in Thousands					12 Months Ended
	Dec. 24, 2019 USD ($)	Dec. 24, 2019 CNY (¥)	Aug. 20, 2019 USD ($)	Aug. 20, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 24, 2019 CNY (¥)	Aug. 20, 2019 CNY (¥)
Beijing Shuhai Data Technology Co., Ltd ("BJ Shuhai")
Net assets acquired:
Operating permits (Note 9)					$ 14,419		¥ 100,380
Cash and cash equivalents					8		59
Other current assets					1,383		9,625
Right-of-use assets					18,664		129,937
Other current liabilities					(2,401)		(16,714)
Lease liabilities					(18,664)		(129,937)
Deferred tax liabilities					(3,605)		¥ (25,095)
Total consideration in cash					$ 9,804	¥ 68,255
Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")
Net assets acquired:
Cash and cash equivalents			$ 9,705						¥ 67,563
Property and Land use right			21,672						150,880
Construction-in-progress			67						465
Other current assets			191,521						1,333,329
Other current liabilities			(172,929)						(1,203,894)
Deferred tax liabilities			(4,754)						¥ (33,096)
Total consideration in cash			$ 45,282	¥ 315,247
Nantong Chenghong Cloud Computing Co., Ltd. ("NT Chenghong")
Net assets acquired:
Cash and cash equivalents	$ 18							¥ 129
Construction-in-progress	22,763							158,471
Equipment	2							13
Other current assets	1,701							11,840
Other current liabilities	(12,760)							(88,830)
Deferred tax liabilities	(233)							¥ (1,623)
Total consideration in cash	$ 11,491	¥ 80,000

ACQUISITION AND DISPOSAL OF SUBSIDIARIES - Additional Information (Details) $ in Thousands						1 Months Ended			12 Months Ended
	Dec. 24, 2019 USD ($)	Dec. 24, 2019 CNY (¥)	Aug. 20, 2019	Jan. 02, 2019 USD ($)	Jan. 02, 2019 CNY (¥)	Aug. 31, 2019	Dec. 31, 2017 CNY (¥)	Sep. 30, 2017 CNY (¥) subsidiary shares	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 CNY (¥)	Aug. 19, 2019	Mar. 31, 2017	Mar. 14, 2017	Dec. 31, 2012 CNY (¥)
Business Acquisition [Line Items]
Total cash consideration									$ 11,857	¥ 82,536,000	¥ 13,000,000
Contingent consideration																	¥ 47,755,000
Number of wholly owned subsidiaries \| subsidiary								6
Impairment losses of long-lived assets										¥ 0	¥ 0	¥ 401,808,000
Impairment losses of goodwill												766,440,000
Gain on disposal of subsidiaries												497,036,000
WiFire Group Inc. ("WiFire Group")
Business Acquisition [Line Items]
Equity interest transferred								66.67%
Consideration price								¥ 6
Cumulative Percentage Ownership after restructuring (as a percentage)								33.33%
Aipu Group
Business Acquisition [Line Items]
Consideration price								¥ 1
Number of shares transferred \| shares								2
Ownership percentage before transaction								50.00%
Tibet Xingtao Culture Communications Co., Ltd. [Member]
Business Acquisition [Line Items]
Equity interest transferred							50.00%
Consideration price							¥ 1					¥ 1
Beijing Shuhai Data Technology Co., Ltd ("BJ Shuhai")
Business Acquisition [Line Items]
Percentage of equity interests acquired				100.00%	100.00%
Total cash consideration				$ 14,113	¥ 98,255,000
Contingent consideration									$ 4,309				¥ 30,000,000
Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")
Business Acquisition [Line Items]
Equity interest (as a percentage)														49.00%	49.00%
Nantong Chenghong Cloud Computing Co., Ltd. ("NT Chenghong")
Business Acquisition [Line Items]
Percentage of equity interests acquired	100.00%	100.00%
Total cash consideration	$ 11,491	¥ 80,000,000
Warburg Pincus
Business Acquisition [Line Items]
Percentage of ownership interest (as a percent)															49.00%	49.00%
Warburg Pincus \| Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")
Business Acquisition [Line Items]
Equity interest (as a percentage)															51.00%
Percentage of equity interest transferred			100.00%			100.00%

ACCOUNTS AND NOTES RECEIVABLE, NET - Accounts and notes receivable and the allowance for doubtful debt (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
ACCOUNTS AND NOTES RECEIVABLE, NET
Accounts receivable	$ 103,830	¥ 722,840		¥ 592,669
Notes receivable	308	2,146		2,606
Allowance for doubtful debt	(9,743)	(67,828)	$ (10,194)	(70,970)	¥ (73,656)
Accounts and notes receivable, net	$ 94,395	¥ 657,158		¥ 524,305

ACCOUNTS AND NOTES RECEIVABLE, NET - Accounts and notes receivable due (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
ACCOUNTS AND NOTES RECEIVABLE, NET
Balance at beginning of the year	$ 10,194	¥ 70,970	¥ 73,656
Additional provision charged to expense	70	485	315
Write-off of accounts receivable	(521)	(3,627)	(3,001)
Balance at end of the year	$ 9,743	¥ 67,828	¥ 70,970

SHORT-TERM INVESTMENTS - Short-term investments consisted (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Short-term investments
SHORT-TERM INVESTMENTS
Time deposits	$ 52,265	¥ 363,856	¥ 245,014

SHORT-TERM INVESTMENTS - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Short-term investments
SHORT-TERM INVESTMENTS
Investments, interest income	$ 1,248	¥ 8,687	¥ 7,303	¥ 4,021

PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
PREPAID EXPENSES AND OTHER CURRENT ASSETS
Prepaid expenses	$ 126,139	¥ 878,155	¥ 565,710
Tax recoverables	82,007	570,913	421,654
Staff advances	268	1,866	10,730
Interest receivables	2,063	14,359	12,037
Deposits	2,498	17,391	39,971
Loan to third parties	10,565	73,557	58,909
Other receivables	8,893	61,908	50,563
Prepaid expenses and other current assets	$ 232,433	¥ 1,618,149	¥ 1,159,574

PROPERTY AND EQUIPMENT, NET - Property and equipment, held under capital leases (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
PROPERTY AND EQUIPMENT, NET
Property and equipment, gross	$ 871,211	¥ 6,065,200	¥ 5,115,505
Less: Accumulated depreciation	(361,228)	(2,514,800)	(1,870,640)
Property plant and equipment net excluding construction in progress	509,983	3,550,400	3,244,865
Construction-in-progress	271,936	1,893,165	786,377
Property and equipment, net	781,919	5,443,565	4,031,242
Property
PROPERTY AND EQUIPMENT, NET
Property and equipment, gross	129,221	899,609	753,319
Leasehold improvements
PROPERTY AND EQUIPMENT, NET
Property and equipment, gross	209,536	1,458,749	932,896
Computer and network equipment
PROPERTY AND EQUIPMENT, NET
Property and equipment, gross	508,447	3,539,709	3,260,336
Optical Fibers
PROPERTY AND EQUIPMENT, NET
Property and equipment, gross	20,501	142,723	142,723
Office equipment
PROPERTY AND EQUIPMENT, NET
Property and equipment, gross	3,175	22,102	24,390
Motor vehicles
PROPERTY AND EQUIPMENT, NET
Property and equipment, gross	$ 331	¥ 2,308	¥ 1,841

PROPERTY AND EQUIPMENT, NET - Depreciation expense (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
PROPERTY AND EQUIPMENT, NET
Depreciation expense	$ 100,050	¥ 696,528	¥ 566,491	¥ 523,500
Cost of Revenues
PROPERTY AND EQUIPMENT, NET
Depreciation expense	92,520	644,108	520,791	458,655
Selling and Marketing Expense
PROPERTY AND EQUIPMENT, NET
Depreciation expense	303	2,107	986	3,188
General and Administrative Expense
PROPERTY AND EQUIPMENT, NET
Depreciation expense	4,325	30,110	28,727	41,675
Research and Development Expense
PROPERTY AND EQUIPMENT, NET
Depreciation expense	$ 2,902	¥ 20,203	¥ 15,987	¥ 19,982

PROPERTY AND EQUIPMENT, NET - Carrying amounts of property and equipment held under capital leases (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	$ 164,812	¥ 1,147,387	¥ 1,227,752
Less: Accumulated depreciation	(58,634)	(408,196)	(291,579)
Property and equipment held under finance leases net excluding construction in progress	106,178	739,191	936,173
Construction-in-progress	271,936	1,893,165	786,377
Property and equipment held under finance leases, net	200,839	1,398,205	1,512,195
Property
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	52,480	365,353	365,353
Computer and network equipment
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	91,831	639,311	719,676
Optical Fibers
Lessee, Lease, Description [Line Items]
Property and equipment held under finance leases, gross	20,501	142,723	142,723
Construction-in-progress
Lessee, Lease, Description [Line Items]
Construction-in-progress	$ 94,661	¥ 659,014	¥ 576,022

PROPERTY AND EQUIPMENT, NET - Property and equipment pledged to secure banking borrowings (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
PROPERTY AND EQUIPMENT, NET
Assets pledged as collateral	$ 31,564	¥ 219,736
Property
PROPERTY AND EQUIPMENT, NET
Assets pledged as collateral	19,763	137,585	¥ 140,393
Leasehold improvements
PROPERTY AND EQUIPMENT, NET
Assets pledged as collateral	$ 9,504	¥ 66,162	71,337
Computer and network equipment
PROPERTY AND EQUIPMENT, NET
Assets pledged as collateral			74,822
Office equipment
PROPERTY AND EQUIPMENT, NET
Assets pledged as collateral			¥ 44

PROPERTY AND EQUIPMENT, NET - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
PROPERTY AND EQUIPMENT, NET
Depreciation expense	$ 100,050	¥ 696,528	¥ 566,491	¥ 523,500
Property, computer and network equipment and optical fiber
PROPERTY AND EQUIPMENT, NET
Depreciation expense	$ 31,122	¥ 216,664	¥ 170,264	¥ 92,920

INTANGIBLE ASSETS, NET - Intangible assets (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Weighted average useful lives of intangible assets
Beginning balance		¥ 355,313	¥ 401,115
Additions		124,697	24,837
Disposals			(6,772)
Foreign currency translation difference		1,613	4,248
Amortization expense	$ (10,203)	(71,028)	(68,115)	¥ (143,602)
Ending balance	58,978	410,595	355,313	401,115
Purchased software
Weighted average useful lives of intangible assets
Beginning balance		47,254	50,629
Additions		11,128	18,744
Disposals			(6,772)
Foreign currency translation difference		413	364
Amortization expense		(16,068)	(15,711)
Ending balance	6,137	42,727	47,254	50,629
Radio Spectrum License
Weighted average useful lives of intangible assets
Beginning balance		72,908	77,141
Foreign currency translation difference		1,200	3,884
Amortization expense		(8,985)	(8,117)
Ending balance	9,354	65,123	72,908	77,141
Operating permits
Weighted average useful lives of intangible assets
Additions		100,380
Amortization expense		(3,136)
Ending balance	13,968	97,244
Contract Backlog
Weighted average useful lives of intangible assets
Beginning balance		5,162	11,750
Amortization expense		(5,162)	(6,588)
Ending balance	0		5,162	11,750
Customer Relationships
Weighted average useful lives of intangible assets
Beginning balance		112,961	137,882
Amortization expense		(24,921)	(24,921)
Ending balance	12,646	88,040	112,961	137,882
Licenses
Weighted average useful lives of intangible assets
Beginning balance		3,883	4,268
Amortization expense		(385)	(385)
Ending balance	503	3,498	3,883	4,268
Supplier Relationships
Weighted average useful lives of intangible assets
Beginning balance		17,070	20,144
Amortization expense		(3,074)	(3,074)
Ending balance	2,010	13,996	17,070	20,144
Trade Names
Weighted average useful lives of intangible assets
Beginning balance		90,591	96,404
Amortization expense		(5,813)	(5,813)
Ending balance	12,178	84,778	90,591	96,404
Platform Software
Weighted average useful lives of intangible assets
Beginning balance			683
Amortization expense			(683)
Ending balance	0			683
Non - Complete Agreement
Weighted average useful lives of intangible assets
Beginning balance		44	154
Amortization expense		(44)	(110)
Ending balance	0		44	154
Internal-use Software
Weighted average useful lives of intangible assets
Beginning balance		5,440	2,060
Additions		13,189	6,093
Amortization expense		(3,440)	(2,713)
Ending balance	$ 2,182	¥ 15,189	¥ 5,440	¥ 2,060

INTANGIBLE ASSETS, NET - Amortization expenses (Details) - Dec. 31, 2019 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
INTANGIBLE ASSETS, NET
2020	$ 8,491	¥ 59,115
2021	7,958	55,400
2022	7,183	50,005
2023	4,923	34,274
2024	1,985	13,820
Annual estimated amortization expenses for intangible assets	$ 30,540	¥ 212,614

INTANGIBLE ASSETS, NET - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Weighted average useful lives of intangible assets
Intangible assets, amortization expenses	$ 10,203	¥ 71,028	¥ 68,115	¥ 143,602
Minimum
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	1 year	1 year
Maximum
Weighted average useful lives of intangible assets
Estimated useful life of intangible assets	32 years	32 years

LAND USE RIGHTS, NET - Land use rights amortized (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
LAND USE RIGHTS, NET
Cost	$ 35,882	¥ 249,804	¥ 159,494
Accumulated amortization	(2,392)	(16,650)	(12,001)
Land use rights, net	$ 33,490	¥ 233,154	¥ 147,493

LAND USE RIGHTS, NET - Land use rights pledged (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
LAND USE RIGHTS, NET
Land use rights	$ 2,297	¥ 15,989	¥ 16,403

GOODWILL - Carrying amount (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
GOODWILL
Beginning Balance	$ 142,137	¥ 989,530	¥ 989,530	¥ 1,755,970
Impairment				(766,440)
Ending Balance	$ 142,137	¥ 989,530	¥ 989,530	¥ 989,530

GOODWILL - Additional Information (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
Changes in the carrying amount of goodwill
Impairment losses of goodwill		¥ 766,440
Hosting and Related Services
Changes in the carrying amount of goodwill
Impairment losses of goodwill	¥ 0	¥ 0

LONG-TERM INVESTMENTS - Long term investments (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
LONG-TERM INVESTMENTS
Equity investments without readily determinable fair values	$ 6,295	¥ 43,824	¥ 51,410
Equity method investments	17,828	124,116	490,376
Available-for-sale debt investments	246	1,713	2,537
Long term investments	$ 24,369	¥ 169,653	¥ 544,323

LONG-TERM INVESTMENTS - Equity Method Investments (Details) ¥ in Thousands, $ in Thousands	1 Months Ended							12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Nov. 30, 2019 USD ($)	Nov. 30, 2019 CNY (¥)	Aug. 31, 2019 USD ($)	Aug. 31, 2019 CNY (¥)	Mar. 31, 2018 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 CNY (¥)	Jun. 30, 2016 CNY (¥)
LONG-TERM INVESTMENTS
Cost investment											¥ 521,863	¥ 312,176	¥ 169,905
Share equity gain (loss)									¥ (45,789)		(31,487)	138,646
Investment in equity investee	$ 17,828							$ 17,828			490,376		124,116
Cost of investments incurred during the period									(351,958)		209,687
Distribution received								(2,902)	(20,200)
Share equity gain (loss) incurred during the period									(34,263)		(186,642)
Derecognize of share equity loss											16,509
Disposal gain								2,564	17,853		16,509
Investment in an equity investee								17,828	124,116	$ 71,322	490,376	450,822
Derecognize of share equity (gain)									19,961
Yizhuang Venture Investment Fund
LONG-TERM INVESTMENTS
Cost investment											101,000	101,000	101,000
Share equity gain (loss)									7,152		25,681	176,036
Distribution received	$ (2,902)	¥ (20,200)
Share equity gain (loss) incurred during the period									1,671		(150,355)
Investment in an equity investee								15,535	108,152	18,425	126,681	277,036
Derecognize of share equity (gain)									(20,200)
Unis Tech
LONG-TERM INVESTMENTS
Cost investment												49,000		¥ 49,000
Share equity gain (loss)												(12,961)
Cost of investments incurred during the period											(49,000)
Share equity gain (loss) incurred during the period											(3,548)
Derecognize of share equity loss											16,509
Disposal gain							¥ 16,509
Investment in an equity investee												36,039
Shihua DC Investment Holdings Limited
LONG-TERM INVESTMENTS
Cost investment											366,623	147,176	29,068
Share equity gain (loss)									(29,068)		(33,658)	(9,429)
Cost of investments incurred during the period					$ (48,487)	¥ (337,555)			(337,555)		219,447
Share equity gain (loss) incurred during the period									(17,718)		(24,229)
Investment in an equity investee										48,428	332,965	137,747
Derecognize of share equity (gain)									22,308
Jingliang Inter Cloud
LONG-TERM INVESTMENTS
Cost investment											6,000		6,000
Share equity gain (loss)									(1,928)		(34)
Cost of investments incurred during the period											6,000
Share equity gain (loss) incurred during the period									(1,894)		(34)
Investment in an equity investee								585	4,072	868	5,966
Jingliang Century Cloud
LONG-TERM INVESTMENTS
Cost investment											4,000		4,000
Cost of investments incurred during the period											4,000
Investment in an equity investee								575	4,000	582	4,000
Huaye Cloud
LONG-TERM INVESTMENTS
Cost investment											23,333
Share equity gain (loss)											(6,319)
Cost of investments incurred during the period									(23,333)		23,333
Share equity gain (loss) incurred during the period									(11,534)		(6,319)
Investment in an equity investee										2,474	17,014
Derecognize of share equity (gain)			$ 2,564	¥ 17,853					17,853
ZJK Energy
LONG-TERM INVESTMENTS
Cost investment											5,907		5,907
Share equity gain (loss)									(1,945)		(2,157)
Cost of investments incurred during the period											5,907
Share equity gain (loss) incurred during the period									212		(2,157)
Investment in an equity investee								569	3,962	$ 545	3,750
WiFire Group Inc. ("WiFire Group")
LONG-TERM INVESTMENTS
Cost investment											15,000	15,000	20,000
Share equity gain (loss)									(20,000)		¥ (15,000)	¥ (15,000)
Cost of investments incurred during the period									5,000
Share equity gain (loss) incurred during the period									(5,000)
Chengdu Qidi Chengxin Education Limit ("Qidi Chengxin")
LONG-TERM INVESTMENTS
Cost investment													¥ 3,930
Cost of investments incurred during the period									3,930
Investment in an equity investee								$ 564	¥ 3,930

LONG-TERM INVESTMENTS - Additional Information (Details) ¥ in Thousands, $ in Thousands	1 Months Ended													12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Nov. 30, 2019 USD ($)	Nov. 30, 2019 CNY (¥)	Aug. 31, 2019 USD ($)	Aug. 31, 2019 CNY (¥)	Mar. 31, 2018 CNY (¥)	Jan. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Sep. 30, 2017 CNY (¥)	Mar. 31, 2017 CNY (¥)	Dec. 31, 2013 CNY (¥)	Apr. 30, 2012 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 CNY (¥)	Jun. 30, 2016 CNY (¥)
Schedule of Equity Method Investments [Line Items]
Impairment of investment																	¥ 20,258
Cost of investment									¥ 312,176							¥ 521,863	312,176	¥ 169,905
Distribution received														$ 2,902	¥ 20,200
Increase (Decrease) in Cost of Investments in Equity Method Investments															(351,958)	209,687
Disposal gain															19,961
Equity method investment loss														(7,261)	(50,553)	(186,642)	53,783
Equity method investment realized gain on disposal														2,564	17,853	16,509
Equity method investment	$ 17,828													17,828		490,376		¥ 124,116
WiFire Group Inc. ("WiFire Group")
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage										33.33%
Investment in an equity investee, addition									15,000					716	5,000
Capital injected									15,000					716	5,000
Percentage of ownership disposed										66.67%
Equity method investment									¥ 0								0
Equity method investment at fair value										¥ 6
Equity Investments Without Readily Determinable Fair Value
Schedule of Equity Method Investments [Line Items]
Equity investments without readily determinable fair values														1,885	13,122	26,653
Dividend income of non-marketable investments														66	461	406
Gain from disposal of non-marketable investments														$ 795	5,536	20,496
Impairment of investment															0	¥ 0	¥ 20,258
Yizhuang Venture Investment Fund
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage	27.694%								27.694%					27.694%		27.694%	27.694%	27.694%
Investment in an equity investee, addition												¥ 50,500	¥ 50,500
Cost of investment									¥ 101,000							¥ 101,000	¥ 101,000	¥ 101,000
Distribution received	$ 2,902	¥ 20,200
Capital injected												¥ 50,500	¥ 50,500
Disposal gain															(20,200)
Equity method investment loss																25,681
Unis Tech
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage																			49.00%
Cost of investment									49,000								49,000		¥ 49,000
Increase (Decrease) in Cost of Investments in Equity Method Investments																(49,000)
Equity method investment cash consideration							¥ 49,000
Equity method investment loss							3,548
Equity method investment realized gain on disposal							¥ 16,509
Shihua DC Investment Holdings Limited
Schedule of Equity Method Investments [Line Items]
Cost of investment									¥ 147,176							366,623	¥ 147,176	29,068
Increase (Decrease) in Cost of Investments in Equity Method Investments					$ (48,487)	¥ (337,555)									(337,555)	219,447
Accumulative share equity loss derecognized	3,204													$ 3,204				22,308
Disposal gain															22,308
Shihua Investment Management [Member]
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage											49.00%
Investment in an equity investee, addition											¥ 13,537					15,531
Capital injected											¥ 13,537					15,531
Share equity loss recognized	$ 2,340													$ 2,340				¥ 16,290
Chengdu Qidi Chengxin Education Limit ("Qidi Chengxin")
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage	59.00%													59.00%				59.00%
Investment in an equity investee, addition														$ 564	3,930
Cost of investment																		¥ 3,930
Capital injected														$ 564	3,930
Increase (Decrease) in Cost of Investments in Equity Method Investments															3,930
Shihua DC Investment Holdings 2 Limited ("Shihua Holdings 2")
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage											49.00%
Investment in an equity investee, addition											¥ 133,639					203,916
Capital injected											¥ 133,639					203,916
Jingliang Inter Cloud
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage								60.00%
Investment in an equity investee, addition								¥ 6,000
Cost of investment																6,000		6,000
Capital injected								¥ 6,000
Increase (Decrease) in Cost of Investments in Equity Method Investments																6,000
Jingliang Century Cloud
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage								40.00%
Investment in an equity investee, addition								¥ 4,000
Cost of investment																4,000		4,000
Capital injected								¥ 4,000
Increase (Decrease) in Cost of Investments in Equity Method Investments																4,000
Huaye Cloud
Schedule of Equity Method Investments [Line Items]
Equity interest, percentage							50.00%
Investment in an equity investee, addition							¥ 23,333
Cost of investment																23,333
Capital injected							¥ 23,333
Increase (Decrease) in Cost of Investments in Equity Method Investments															(23,333)	23,333
Disposal gain			$ 2,564	¥ 17,853											¥ 17,853
Total cash consideration on disposal of equity interests			3,352	23,333
Investment loss			$ 2,564	¥ 17,853
ZJK Energy
Schedule of Equity Method Investments [Line Items]
Cost of investment																5,907		¥ 5,907
Increase (Decrease) in Cost of Investments in Equity Method Investments																¥ 5,907

BANK BORROWINGS - Bank borrowings (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
BANK BORROWINGS
Short-term bank borrowings	$ 33,684	¥ 234,500	¥ 50,000
Long-term bank borrowings, current portion	4,668	32,500	75,284
Bank borrowings, current portion, Total	38,352	267,000	125,284
Long-term bank borrowings, non-current portion	11,419	79,500	112,000
Total bank borrowings	$ 49,771	¥ 346,500	¥ 237,284

BANK BORROWINGS - Unused loan facilities (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Debt Instrument
Short-term borrowings	$ 33,684	¥ 234,500	¥ 50,000
Long-term bank borrowings (including current portion)		112,000	187,284
Unsecured Borrowing
Debt Instrument
Short-term borrowings		34,500
Long-term bank borrowings (including current portion)			49,284
Secured by a Subsidiary's Fixed Assets and Land Use Right \| Long-term bank borrowings, (including current portion) 1
Debt Instrument
Long-term bank borrowings (including current portion)		112,000	138,000
Secured by restricted cash \| Short-term bank borrowings 1
Debt Instrument
Short-term borrowings		¥ 200,000	¥ 50,000

BANK BORROWINGS - Unused loan facilities (Parenthetical) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Debt Instrument
Assets pledged as collateral	$ 31,564	¥ 219,736
Short-term bank borrowings 1
Debt Instrument
Restricted cash	31,000	215,816	¥ 60,796
Long-term bank borrowings, (including current portion) 1 \| Fixed assets
Debt Instrument
Assets pledged as collateral	29,267	203,747	286,596
Long-term bank borrowings, (including current portion) 1 \| Land Use Rights [Member]
Debt Instrument
Assets pledged as collateral	$ 2,297	¥ 15,989	¥ 16,403

BANK BORROWINGS - Additional Information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Short and long term bank borrowings
Short-term bank borrowings, weighted average interest rate	4.56%	4.56%	4.05%
Short-term bank borrowings, term	1 year
Unused loan facilities (in RMB) or (in dollars)	$ 46,837	¥ 326,068	¥ 21,375
Long Term Bank Borrowings
Short and long term bank borrowings
Long-term bank borrowings, weighted average interest rate	5.28%	5.28%	5.31%

ACCRUED EXPENSES AND OTHER PAYABLES (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
ACCRUED EXPENSES AND OTHER PAYABLES
Payroll and welfare payables	$ 25,740	¥ 179,195	¥ 224,265
Value-added tax and other taxes payable	2,086	14,523	16,931
Payables for office supplies and utilities	3,528	24,562	21,719
Payables for the purchase of property and equipment	79,255	551,759	207,512
Payables for the purchase of intangible assets	421	2,934	4,576
Accrued service fees	7,576	52,746	41,618
Interest payables	8,469	58,961	54,376
Liability classified RSU	303	2,109	4,970
Payables for acquisitions	6,867	47,805	47,755
Others	6,368	44,341	35,598
Accrued expenses and other payables	$ 140,613	¥ 978,935	¥ 659,320

LEASES - Total lease cost (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Finance lease cost:
Depreciation	$ 31,122	¥ 216,664
Interest expenses	17,263	120,185	¥ 79,935	¥ 63,757
Operating lease cost	30,853	214,795
Total lease cost	$ 79,238	¥ 551,644

LEASES - Other information related to leases (Details) - 12 months ended Dec. 31, 2019 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash payments for operating leases	$ 27,748	¥ 193,174
Operating cash payments for finance leases	$ 47,921	¥ 333,614

LEASES - Future lease payments under operating leases and finance leases (Details) - Dec. 31, 2019
¥ in Thousands, $ in Thousands

USD ($)

CNY (¥)

Future lease payments under finance leases

2020

$ 52,390

¥ 364,729

2021

55,449

386,027

2022

54,234

377,564

2023

17,660

122,947

2024

17,382

121,008

2025 and thereafter

270,144

1,880,687

Total future lease payments

467,259

3,252,962

Less: Imputed interest

(224,575)

(1,563,446)

Present value of future lease payments

^[1]

242,684

1,689,516

Future lease payments under operating leases

2020

67,033

466,670

2021

53,657

373,552

2022

23,075

160,644

2023

12,501

87,028

2024

6,821

47,484

2025 and thereafter

92,996

647,419

Total future lease payments

256,083

1,782,797

Less: Imputed interest

(76,615)

(533,376)

Present value of future lease payments

^[1]

$ 179,468

¥ 1,249,421

[1]

* Present value of future operating lease payments consisted of current portion of operating lease liabilities, non-current portion of operating lease liabilities and operating lease liabilities in amounts due to related parties, amounting to RMB437,817 (US$62,888), RMB579,102 (US$83,183) and RMB232,502 (US$33,397) for the year ended December 31, 2019, respectively.Present value of future finance lease payments consisted of current portion of finance lease liabilities, non-current portion of finance lease liabilities and finance lease liabilities in amounts due to related parties, amounting to RMB227,115 (US$32,623), RMB896,927 (US$128,836) and RMB565,474 (US$81,225) for the year ended December 31, 2019, respectively.

LEASES - Additional information (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 CNY (¥)
Cash paid for amounts included in the measurement of lease liabilities:
Operating lease's weighted average remaining lease term	9 years 4 months 24 days				9 years 4 months 24 days
Operating lease's weighted average discount rate	6.09%				6.09%
Finance lease's weighted average remaining lease term	15 years 3 months 18 days				15 years 3 months 18 days
Finance lease's weighted average discount rate	8.43%				8.43%
Operating lease cost	$ 30,853	¥ 214,795
Interest expenses	17,263	¥ 120,185	¥ 79,935	¥ 63,757
Current portion of operating lease liabilities	62,888				¥ 437,817
Non-current portion of operating lease liabilities	83,183				579,102
Operating lease liabilities due to related parties	33,397				232,502
Current portion of finance lease liabilities	32,623		219,695		227,115
Non-current portion of finance lease liabilities	128,836		¥ 765,993		896,927
Finance lease liabilities due to related parties	$ 81,225				¥ 565,474

. BONDS PAYABLE - Long-Term Borrowings, Including Bonds Payable, Bank and Other Borrowings (Detail) - Dec. 31, 2019 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
BONDS PAYABLE
2020	$ 136,100	¥ 947,505
2021	306,223	2,131,860
2022	$ 5,817	¥ 40,500

BONDS PAYABLE - Additional Information (Details) ¥ in Thousands, $ in Thousands							12 Months Ended
	Aug. 12, 2019 USD ($)	Apr. 16, 2019 USD ($)	Apr. 15, 2019 USD ($)	Apr. 15, 2019 CNY (¥)	Sep. 29, 2017 USD ($)	Aug. 17, 2017 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2017 CNY (¥)	Aug. 17, 2017 USD ($)
Debt Instrument
Proceeds from issuance of bonds, net							$ 289,018	¥ 2,012,084	¥ 1,936,154
Loss on debt extinguishment							$ 2,714	¥ 18,895
Bonds 7% Due 2020
Debt Instrument
Debt instrument, face amount					$ 100,000					$ 200,000
Principal amount repurchased	$ 18,000	$ 150,839
Total aggregate principal amount repurchased (as a percent)		50.28%
Outstanding principal amount	$ 131,161
Debt instrument, stated rate					7.00%					7.00%
Debt instrument, premium price					100.04
Debt instrument, effective yield					6.98%
Proceeds from issuance of bonds, net \| ¥						¥ 1,926,419
Bonds 7.875%, Due 2021
Debt Instrument
Debt instrument, face amount			$ 300,000
Debt instrument, stated rate			7.875%
Proceeds from issuance of bonds, net			$ 283,903	¥ 1,976,474

DEFERRED GOVERNMENT GRANTS - Movements of Deferred Grants (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
DEFERRED GOVERNMENT GRANTS
Balance at beginning of the year	$ 2,268	¥ 15,792	¥ 22,435	¥ 30,993
Additions			500	2,877
Decrease due to disposal of subsidiaries				(3,573)
Recognized as a reduction of depreciation expense	(1,047)	(7,291)	(7,143)	(7,862)
Balance at end of the year	$ 1,221	¥ 8,501	¥ 15,792	¥ 22,435

DEFERRED GOVERNMENT GRANTS - Additional Information (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
DEFERRED GOVERNMENT GRANTS
Government grants received	¥ 0	¥ 500	¥ 2,877

TREASURY STOCK (Details) - shares	12 Months Ended
TREASURY STOCK (Details) - shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
TREASURY STOCK
Share repurchase plan, shares repurchased (in shares)	242,830	0	3,448,482
American Depository Shares
TREASURY STOCK
Share repurchase plan, shares repurchased (in shares)	242,830	0	3,448,482

ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
ACCUMULATED OTHER COMPREHENSIVE INCOME
Beginning balance		¥ 5,363,184	¥ 5,201,004	¥ 6,151,017
Other comprehensive income (loss)	$ (1,160)	(8,075)	88,652	(120,963)
Ending balance	751,478	5,231,628	5,363,184	5,201,004
Accumulated Translation Adjustment
ACCUMULATED OTHER COMPREHENSIVE INCOME
Beginning balance		85,979	(2,673)	118,290
Other comprehensive income (loss)		(8,075)	88,652	(120,963)
Ending balance	$ 11,190	¥ 77,904	¥ 85,979	¥ (2,673)

MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
PRC
MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN
Total expense for defined contribution plan	$ 17,419	¥ 121,266	¥ 122,362	¥ 134,053

SHARE-BASED COMPENSATION - Employee share options activity (Details) - 2010 Plan $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2019 CNY (¥) shares
Number of options
Outstanding, beginning balance \| shares	1,479,214
Exercised (in shares) \| shares	(33,869)
Outstanding, ending balance \| shares	1,445,345	1,479,214
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number \| shares	1,445,345		1,445,345
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price \| $ / shares	$ 0.51
Weighted average exercise price
Outstanding, beginning balance \| $ / shares	0.51
Exercised \| $ / shares	0.55
Outstanding, ending balance \| $ / shares	$ 0.51	$ 0.51
Weighted average remaining contractual term
Outstanding, December 31, 2019	1 year 3 months 18 days	2 years 2 months 12 days
Vested and expected to vest at December 31, 2018	1 year 3 months 18 days
Exercisable as of December 31, 2019	1 year 3 months 18 days
Aggregate intrinsic value
Outstanding, December 31, 2019	$ 1,005		¥ 6,997
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 \| $	$ 1,005

SHARE-BASED COMPENSATION - Restricted stock units activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
2010 Plan
Number of RSUs
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 0.51
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,445,345
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 1,005
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 0.55
Restricted Stock Units (RSUs)
Number of RSUs
Unvested, beginning balance	3,218,452
Granted	544,120
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 7.67
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	7.22
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	$ 6.52
Forfeited	(210,392)
Unvested, ending balance	2,696,129	3,218,452
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested	$ 19,547
Vested	(856,051)
Weighted-average grant date fair value
Unvested, beginning balance (in dollars per share)	$ 6.66
Unvested, ending balance (in dollars per share)	$ 6.83	$ 6.66
Weighted-average remaining contractual terms (Years)
Unvested, December 31, 2018	7 years 9 months 18 days	9 years

SHARE-BASED COMPENSATION - Share compensation expense (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
SHARE-BASED COMPENSATION
Share based compensation expense	$ 6,308	¥ 43,916	¥ 59,538	¥ 47,129
Cost of Revenues
SHARE-BASED COMPENSATION
Share based compensation expense	271	1,884	2,668	(277)
Selling and Marketing Expense
SHARE-BASED COMPENSATION
Share based compensation expense	51	354	2,139	(681)
General and Administrative Expense
SHARE-BASED COMPENSATION
Share based compensation expense	5,817	40,501	53,346	47,945
Research and Development Expense
SHARE-BASED COMPENSATION
Share based compensation expense	$ 169	¥ 1,177	¥ 1,385	¥ 142

SHARE BASED COMPENSATION - Additional Information (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands			12 Months Ended
	Oct. 30, 2015 shares	Jul. 16, 2010 shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2017 CNY (¥) shares	Dec. 31, 2019 CNY (¥) shares	May 29, 2014 shares
SHARE-BASED COMPENSATION
Aggregate intrinsic value of options exercise \| $			$ 22		$ 248		$ 306
Share based compensation expense			$ 6,308	¥ 43,916		¥ 59,538		¥ 47,129
Dermot Entities
SHARE-BASED COMPENSATION
Share based compensation expense \| ¥				¥ 0		¥ 0		¥ 5,752
Performance Based Awards \| One or Four-Year Period
SHARE-BASED COMPENSATION
Share based compensation, RSUs granted			464,120	464,120	487,368	487,368	611,111	611,111
Performance Based Awards \| Option One
SHARE-BASED COMPENSATION
Performance review period			1 year	1 year
Performance Based Awards \| Option Two
SHARE-BASED COMPENSATION
Performance review period			4 years	4 years
Restricted Stock Units (RSUs)
SHARE-BASED COMPENSATION
Share based compensation, RSUs granted			544,120	544,120
Aggregate fair value, unvested			$ 19,547						¥ 136,082
Weighted-average grant-date fair value \| $ / shares			$ 7.67		$ 6.39		$ 6.31
Total fair value vested \| $			$ 6,185		$ 9,422		$ 18,238
Unrecognized share-based compensation cost			$ 8,606						¥ 59,913
Unrecognized compensation costs, weighted-average recognition period			2 years 6 months	2 years 6 months
Minimum Performance Target
SHARE-BASED COMPENSATION
Share based compensation, RSUs granted			64,000	64,000	2,188,226	2,188,226
Market Based Awards
SHARE-BASED COMPENSATION
Share based compensation, RSUs granted			16,000	16,000	547,056	547,056
2014 Plan
SHARE-BASED COMPENSATION
Share based compensation, option expiry period	10 years
2014 Plan \| Maximum
SHARE-BASED COMPENSATION
Share based compensation, maximum aggregate number of ordinary shares to be issued	39,606,817									20,461,380
Share based compensation, option vesting period	4 years
Share based compensation arrangement by share based payment award maximum annual plan percentage increase to number of shares available for grant	15.00%
2014 Plan \| Minimum
SHARE-BASED COMPENSATION
Share based compensation, option vesting period	3 years
2010 Plan
SHARE-BASED COMPENSATION
Share based compensation, option expiry period		10 years
Share based compensation, option outstanding			1,445,345		1,479,214	1,479,214			1,445,345
Share based compensation, aggregate intrinsic value			$ 1,005						¥ 6,997
Share based compensation, fair value of option outstanding at grant date			2,084						¥ 14,508
Share based compensation, fair value of shares exercised during the period \| $			$ 42		$ 239		$ 404
2010 Plan \| Maximum
SHARE-BASED COMPENSATION
Share based compensation, maximum aggregate number of ordinary shares to be issued		39,272,595
Share based compensation, option vesting period		4 years
2010 Plan \| Minimum
SHARE-BASED COMPENSATION
Share based compensation, option vesting period		3 years

TAXATION - Income Taxes (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
TAXATION
Loss before income taxes	$ (25,252)	¥ (175,809)	¥ (162,325)	¥ (1,007,814)
Non-PRC
TAXATION
Loss before income taxes	(25,676)	(178,762)	(214,063)	(286,388)
PRC
TAXATION
Loss before income taxes	$ 424	¥ 2,953	¥ 51,738	¥ (721,426)

TAXATION - Income Tax Benefits (Expense) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
TAXATION
Current	$ (10,101)	¥ (70,324)	¥ (44,187)	¥ (37,856)
Deferred	9,320	64,887	19,776	128,026
Income tax benefits (expenses)	$ (781)	¥ (5,437)	¥ (24,411)	¥ 90,170

TAXATION - PRC operations (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
TAXATION
Loss before income taxes	$ (25,252)	¥ (175,809)	¥ (162,325)	¥ (1,007,814)
Income tax benefits computed at applicable tax rates (25%)	6,313	43,952	40,581	251,954
Non-deductible expenses	(3,316)	(23,082)	(2,834)	(5,468)
Research and development expenses	2,829	19,688	25,906	11,895
Preferential rate	2,903	20,213	11,701	(90,076)
Current and deferred tax rate differences	(1,250)	(8,699)	37,934	33,366
International rate differences	(11,069)	(77,066)	(63,525)	59,029
Tax exempted income	108	754
Unrecognized tax benefits	248	1,728	1,472	(6,259)
Deferred tax expense				2,851
Change in valuation allowance	3,652	25,423	(79,694)	(174,388)
Prior year provision to return true up	(1,199)	(8,348)	4,048	7,266
Income tax benefits (expenses)	$ (781)	¥ (5,437)	¥ (24,411)	¥ 90,170

TAXATION - PRC operations (Parenthetical) (Details)	12 Months Ended
TAXATION - PRC operations (Parenthetical) (Details)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
TAXATION
Statutory income tax rate	25.00%	25.00%	25.00%

TAXATION - Deferred Taxes (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Non-current
Allowance for doubtful debt	$ 6,976	¥ 48,568	¥ 38,993
Accrued expenses	3,036	21,139	25,894
Tax losses	21,115	146,996	151,440
Property and equipment	2,955	20,567	15,299
Intangible assets	530	3,691	2,221
Finance lease	9,932	69,148	50,980
Deferred government grant	171	1,189	2,662
Loss picked up on equity method investments	8,145	56,706	56,616
Valuation allowance	(22,786)	(158,638)	(184,664)
Total deferred tax assets	30,074	209,366	159,441
Non-current
Intangible assets	14,970	104,217	89,536
Property and equipment	11,696	81,424	48,496
Capitalized interest expenses	2,176	15,146	15,837
Gain picked up from equity method investments	256	1,785	3,851
Total non-current deferred tax liabilities	$ 29,098	¥ 202,572	¥ 157,720

TAXATION - Unrecognized Tax Benefits (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
TAXATION
Balance at beginning of year	$ 647	¥ 4,509	¥ 11,582
Reversal based on tax positions related to prior years	(469)	(3,266)	(9,070)
Additions based on tax positions related to the current year	69	479	1,997
Balance at end of year	$ 247	¥ 1,722	¥ 4,509

TAXATION - Additional Information (Details) ¥ in Thousands, $ in Thousands		1 Months Ended			12 Months Ended									24 Months Ended
	Jan. 01, 2008	Nov. 30, 2016	Oct. 31, 2015	Apr. 30, 2011	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2008	Dec. 31, 2014	Dec. 31, 2019 CNY (¥)
TAXATION
Unified enterprise income tax rate	25.00%
Undistributed earnings from its PRC subsidiaries					$ 189,291										¥ 1,317,809
Unrecognized tax benefits					351		¥ 6,677								2,443
Unrecognized tax benefits impact in the effective rate					$ 129										897
Shanghai Blue Cloud Technology Co., Ltd. ("SH Blue Cloud")
TAXATION
Preferential tax rate			15.00%		15.00%	15.00%	15.00%	15.00%
Preferential tax rate, additional term			3 years
Shenzhen Diyixian Telecommunication Co., Ltd. ("SZ DYX")
TAXATION
Preferential tax rate		15.00%			15.00%	15.00%	15.00%	15.00%
Preferential tax rate, additional term		3 years
Beijing 21Vianet Broad Band Data Center Co., Ltd. ("21Vianet Beijing")
TAXATION
Preferential tax rate					15.00%	15.00%	15.00%	15.00%					15.00%
21Vianet (Xi'an) Information Outsourcing Industry Park Services Co., Ltd. ("Xi'an Sub")
TAXATION
Preferential tax rate				15.00%	15.00%	15.00%	15.00%	25.00%
Beijing iJoy Information Technology Co., Ltd. ("BJ iJoy")
TAXATION
Unified enterprise income tax rate					25.00%	25.00%
Tax holiday, exemption rate								50.00%	50.00%	50.00%	100.00%	100.00%
Tax holiday reduction period										3 years				2 years
TAIWAN \| DYX Taiwan
TAXATION
Income tax rate					20.00%	20.00%	20.00%	17.00%
PRC
TAXATION
Income tax rate on PRC tax resident enterprises					25.00%	25.00%
Net tax operating losses from PRC subsidiaries (in RMB)					$ 94,983										661,253
Interest expenses (in RMB)					(211)	¥ (1,447)	¥ (2,761)	¥ 674
Accumulated interest expenses (in RMB)					$ 104		¥ 2,168								¥ 721
PRC \| Minimum
TAXATION
Net tax operating losses expiration year					2020	2020
PRC \| Maximum
TAXATION
Net tax operating losses expiration year					2029	2029
HONG KONG \| 21Vianet Hong Kong Entities
TAXATION
Income tax rate					16.50%	16.50%	16.50%	16.50%
Non-PRC
TAXATION
Withholding tax percent					10.00%	10.00%

RELATED PARTY TRANSACTIONS - Related party transactions (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2019 CNY (¥)
RELATED PARTY TRANSACTIONS
Related party transaction, loans from	$ 23,979		¥ 52,328		¥ 166,935
Jingliang Interconnected Cloud Technology Co Ltd \| Service Expense [Member]
RELATED PARTY TRANSACTIONS
Related party transaction expense	1,268	¥ 8,829	3,477
Beijing Tuspark Harmonious Investment Development Co Ltd
RELATED PARTY TRANSACTIONS
Related party transaction, loans from	3,579		13,850		24,917
Related party transaction, Lease deposit paid			11,472
Related party transaction, Lease payment paid	9,887	68,832
Xiaomi Communication Technology Limited and Beijing Xiaomi Mobile Software Limited \| Service Revenue
RELATED PARTY TRANSACTIONS
Revenue from related party transactions	62,871	437,694	374,085	¥ 220,110
Qidi Bus (Beijing) Technology Co., Ltd \| Service Revenue
RELATED PARTY TRANSACTIONS
Revenue from related party transactions	1,067	7,427
Beijing Kingsoft Cloud Network Technology Limited
RELATED PARTY TRANSACTIONS
Related party transaction, loans from	154		609		1,073
Beijing Kingsoft Cloud Network Technology Limited \| Service Revenue
RELATED PARTY TRANSACTIONS
Revenue from related party transactions	499	3,475	6,281	8,046
Beijing Kingsoft Cloud Network Technology Limited \| Service Expense [Member]
RELATED PARTY TRANSACTIONS
Related party transaction expense	502	3,492	13,204	7,775
Dyxnet Corporate Service Limited \| Service Expense [Member]
RELATED PARTY TRANSACTIONS
Related party transaction expense			5,238	6,424
Beijing Cheetah Mobile Technology Limited \| Service Revenue
RELATED PARTY TRANSACTIONS
Revenue from related party transactions	24	169	2,079	5,128
Dyxnet Internet Center Limited \| Equipment and Property
RELATED PARTY TRANSACTIONS
Related party transaction, purchase of equipment				1,234
Beijing Bozhiruihai Network Technology Co., Ltd. ("BZRH") \| Service Expense [Member]
RELATED PARTY TRANSACTIONS
Related party transaction expense			4,239
WiFire (Beijing) Technology Co., Ltd.
RELATED PARTY TRANSACTIONS
Revenue from related party transactions	278	1,934	16,490	9,726
Related party transaction, loans from	909				6,330
WiFire (Beijing) Technology Co., Ltd. \| Service Expense [Member]
RELATED PARTY TRANSACTIONS
Related party transaction expense			4,066	1,616
Beijing Taiji Data Tech Co Ltd
RELATED PARTY TRANSACTIONS
Revenue from related party transactions	1,135	7,899	13,681
Related party transaction expense	2,865	19,942	7,095
Related party transaction, loans to	215	1,500
Related party transaction, loans from			6,724
Beijing Chengyishidai Network Technology Company Limited
RELATED PARTY TRANSACTIONS
Related party transaction expense	5,590	38,918	18,667	2,979
Related party transaction, loans from			7,158
UNISVNET Technology Co Ltd \| Service Revenue
RELATED PARTY TRANSACTIONS
Revenue from related party transactions			1,011
Other Related Party Transactions
RELATED PARTY TRANSACTIONS
Related party transaction, loans from	137		1,826		950
Other Related Party Transactions \| Service Revenue
RELATED PARTY TRANSACTIONS
Revenue from related party transactions	215	1,494	4,493	3,314
Other Related Party Transactions \| Service Expense [Member]
RELATED PARTY TRANSACTIONS
Related party transaction expense	843	5,866	6,396	2,632
Beijing Fastweb Network Technology Co Ltd Bjfastweb
RELATED PARTY TRANSACTIONS
Related party transaction, loans to				20,000
Related party transaction, interest income from loan	101	700	700	210
Beijing Fastweb Network Technology Co Ltd Bjfastweb \| Equipment and Property
RELATED PARTY TRANSACTIONS
Related party transaction, sales of equipment				1,021
WNT Technology Limited \| Equipment and Property
RELATED PARTY TRANSACTIONS
Related party transaction, purchase of equipment				¥ 2,629
Ziguang Financial Leasing Co Ltd
RELATED PARTY TRANSACTIONS
Related party transaction, loans from	3,901		8,938		¥ 27,160
Related party transaction, Lease deposit paid	884	6,154	2,042
Related party transaction, Lease payment paid	$ 2,464	¥ 17,156	¥ 4,897

RELATED PARTY TRANSACTIONS - Related party balances (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Amounts due from related parties current:
Amounts due from related parties current	$ 43,331	¥ 301,665	¥ 125,446
Amounts due from related parties non-current:
Amounts due from related parties non current	2,967	20,654	34,424
Amounts due to related parties current:
Amount due to a related party	23,979	166,935	52,328
Amounts due from related parties non-current:
Amounts due to related parties non current	107,142	745,899	504,478
Marble Stone SH Group Limited ("Marble SH")
Amounts due from related parties current:
Amounts due from related parties current	14,379	100,106
Shihua DC Investment Group Limited ("Shihua Investment Group") [Member]
Amounts due from related parties current:
Amounts due from related parties current	11,856	82,542
Amounts due to related parties current:
Amount due to a related party	12,069	84,021
Xiaomi Communication Technology Limited and Beijing Xiaomi Mobile Software Limited
Amounts due from related parties current:
Amounts due from related parties current	5,714	39,778	41,159
Marble Stone Holdings Limited ("Marble Holdings")
Amounts due from related parties current:
Amounts due from related parties current	4,271	29,736
Shihua DC Investment Management Limited ("Shihua Investment Management")
Amounts due from related parties current:
Amounts due from related parties current	4,008	27,905
Amounts due to related parties current:
Amount due to a related party	3,230	22,484
WiFire (Beijing) Technology Co., Ltd.
Amounts due from related parties current:
Amounts due from related parties current			36,578
Amounts due to related parties current:
Amount due to a related party	909	6,330
Shanghai Fawei Technology Co., Ltd. (SH Fawei)
Amounts due from related parties current:
Amounts due from related parties current			13,742
Shanghai Shibei Hi-Tech Co., Ltd.
Amounts due from related parties current:
Amounts due from related parties current	1,408	9,800	9,800
Beijing Kingsoft Cloud Network Technology Limited
Amounts due from related parties current:
Amounts due from related parties current			982
Amounts due to related parties current:
Amount due to a related party	154	1,073	609
Wuhan Fastweb Cloud Computing Company Limited
Amounts due from related parties current:
Amounts due from related parties current			5,131
Beijing Taiji Data Tech Co Ltd
Amounts due from related parties current:
Amounts due from related parties current	1,364	9,499	13,542
Amounts due to related parties current:
Amount due to a related party			6,724
Qidi Bus (Beijing) Technology Co., Ltd
Amounts due from related parties current:
Amounts due from related parties current	179	1,249
UNISVNET Technology Co Ltd
Amounts due from related parties current:
Amounts due from related parties current			1,072
Other Related Party Transactions
Amounts due from related parties current:
Amounts due from related parties current	152	1,050	3,440
Amounts due from related parties non-current:
Amounts due from related parties non current	86	596
Amounts due to related parties current:
Amount due to a related party	137	950	1,826
Beijing Fastweb Network Technology Co Ltd Bjfastweb
Amounts due from related parties non-current:
Amounts due from related parties non current			20,910
Beijing Bozhi Ruihai Network Technology Co Ltd
Amounts due to related parties current:
Amount due to a related party			5,088
Beijing Chengyishidai Network Technology Company Limited
Amounts due to related parties current:
Amount due to a related party			7,158
Ziguang Financial Leasing Co Ltd
Amounts due from related parties non-current:
Amounts due from related parties non current	1,177	8,195	2,042
Amounts due to related parties current:
Amount due to a related party	3,901	27,160	8,938
Amounts due from related parties non-current:
Amounts due to related parties non current	6,807	47,388	12,527
Beijing Tuspark Harmonious Investment Development Co Ltd
Amounts due from related parties non-current:
Amounts due from related parties non current	1,704	11,863	11,472
Amounts due to related parties current:
Amount due to a related party	3,579	24,917	13,850
Amounts due from related parties non-current:
Amounts due to related parties non current	$ 100,335	¥ 698,511	443,622
Wi Fire Shanghai Network Technology Co Ltd
Amounts due to related parties current:
Amount due to a related party			8,135
Shihua DC Investment Holdings Limited
Amounts due from related parties non-current:
Amounts due to related parties non current			¥ 48,329

RELATED PARTY TRANSACTIONS - Additional information (Details) - 12 months ended Dec. 31, 2019 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)	CNY (¥)
RELATED PARTY TRANSACTIONS
Impairment of amount due from equity investees	$ 7,490	¥ 52,142
Shihua Holdings 2's subsidiaries
RELATED PARTY TRANSACTIONS
Business acquisition, equity interests acquired	100.00%		100.00%
WiFire (Beijing) Technology Co., Ltd.
RELATED PARTY TRANSACTIONS
Amount due from/to related parties offset	$ 2,926		¥ 20,367
Impairment of amount due from equity investees	$ 7,490	¥ 52,142

SEGMENT REPORTING- Long lived assets and revenues (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
SEGMENT REPORTING
Revenues	$ 544,251	¥ 3,788,967	¥ 3,401,037	¥ 3,392,705
Cost	(409,308)	(2,849,518)	(2,456,166)	(2,634,295)
Gross profit (loss)	134,943	939,449	944,871	758,410
Operating income (expenses)
Operating income	986	6,862	5,027	5,439
Sales and marketing expenses	(29,634)	(206,309)	(172,176)	(256,682)
Research and development expenses	(12,754)	(88,792)	(92,109)	(149,143)
General and administrative expenses	(59,651)	(415,277)	(462,637)	(519,950)
(Allowance) reversal for doubtful debt	(224)	(1,557)	598	(37,427)
Impairment of receivables from equity investees	(7,490)	(52,142)
Changes in the fair value of contingent purchase consideration payables			13,905	(937)
Impairment of goodwill				(766,440)
Impairment of long-lived assets		0	0	(401,808)
Operating loss	26,176	182,234	237,479	(1,368,538)
Hosting and Related Services
Operating income (expenses)
Impairment of goodwill		0		0
Operating Segments \| Hosting and Related Services
SEGMENT REPORTING
Revenues	544,251	3,788,967	3,401,037	2,975,178
Cost	(409,308)	(2,849,518)	(2,456,166)	(2,130,279)
Gross profit (loss)	134,943	939,449	944,871	844,899
Operating income (expenses)
Operating income	986	6,862	5,027	5,439
Sales and marketing expenses	(29,634)	(206,309)	(172,176)	(171,761)
Research and development expenses	(12,754)	(88,792)	(92,109)	(97,597)
General and administrative expenses	(59,651)	(415,277)	(462,637)	(417,154)
(Allowance) reversal for doubtful debt	(224)	(1,557)	598	(6,257)
Changes in the fair value of contingent purchase consideration payables			13,905	(937)
Operating loss	$ 26,176	¥ 182,234	¥ 237,479	156,632
Operating Segments \| Managed Network Services
SEGMENT REPORTING
Revenues				417,527
Cost				(504,016)
Gross profit (loss)				(86,489)
Operating income (expenses)
Sales and marketing expenses				(84,921)
Research and development expenses				(51,546)
General and administrative expenses				(102,796)
(Allowance) reversal for doubtful debt				(31,170)
Impairment of goodwill				(766,440)
Impairment of long-lived assets				(401,808)
Operating loss				¥ (1,525,170)

SEGMENT REPORTING - Additional Information (Details) - segment	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEGMENT REPORTING
Number of segments	1	1	1	2

RESTRICTED NET ASSETS (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
RESTRICTED NET ASSETS
Minimum required Percentage of annual after-tax profit to the general statutory reserve	10.00%	10.00%
Maximum requirement of each of the Entity's PRC Subsidiaries' after-tax profits to be allocated to a general reserve fund as a percentage of each Subsidiaries' registered capital	50.00%	50.00%
Statutory reserves	$ 8,687	¥ 60,469	¥ 42,403
Restricted net asset, PRC generally accepted accounting principles (in RMB) or (in dollars)	$ 967,584	¥ 6,736,125

LOSS PER SHARE - Basic and diluted loss per share (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 CNY (¥) ¥ / shares shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares
Numerator:
Net loss	$ (26,033)	¥ (181,246)	¥ (186,736)	¥ (917,644)
Net loss (profit) attributable to noncontrolling interest and redeemable noncontrolling interest	(150)	(1,046)	(18,329)	144,914
Net loss attributable to ordinary shareholders	(26,183)	(182,292)	(205,065)	(772,730)
Plus increase in accretion of redeemable noncontrolling interests \| ¥				(141,896)
Adjusted net loss attributable to ordinary shareholders	$ (26,183)	¥ (182,292)	¥ (205,065)	¥ (914,626)
Denominator:
Weighted average number of shares outstanding - basic (in shares)	668,833,756	668,833,756	674,732,130	672,836,226
Weighted average number of shares outstanding - diluted (in shares)	668,833,756	668,833,756	674,732,130	672,836,226
Loss per share-Basic:
Net loss \| (per share)	$ (0.04)	¥ (0.27)	¥ (0.30)	¥ (1.36)
Basic (in per share) \| (per share)	(0.04)	(0.27)	(0.30)	(1.36)
Loss per share-Diluted:
Net loss \| (per share)	(0.04)	(0.27)	(0.30)	(1.36)
Diluted (in per share) \| (per share)	$ (0.04)	¥ (0.27)	¥ (0.30)	¥ (1.36)

LOSS PER SHARE - Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
LOSS PER SHARE
Shares issued to depository bank (in shares)	6,700,002	0	9,000,000

SHARE CAPITAL (Details)	12 Months Ended
SHARE CAPITAL (Details)	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares	Oct. 31, 2019 $ / shares shares	Oct. 31, 2010 Vote
Class A Ordinary Shares
SHARE CAPITAL
Entitled vote per ordinary share \| Vote					1
Issuance of new shares for share option exercise and restricted share units vested	304,200	3,070,500	3,119,052
Shares issued	1,200,000,000	1,200,000,000
Class B Ordinary Shares
SHARE CAPITAL
Entitled vote per ordinary share \| Vote					10
Conversion share ratio					1
Shares issued	300,000,000	300,000,000
Class C Ordinary Shares
SHARE CAPITAL
Entitled vote per ordinary share \| Vote					1
Conversion share ratio					1
Shares issued	60,000	0
Class C Ordinary Shares \| Personal Group Limited
SHARE CAPITAL
Shares issued				60,000
Share Price \| $ / shares				$ 1.35

REDEEMABLE NONCONTROLLING INTERESTS - Disposal of subsidiaries (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)
REDEEMABLE NONCONTROLLING INTERESTS
Beginning balance	¥ 700,000
Loss for the year	(141,896)
Increase in accretion of redeemable noncontrolling interests	141,896
Reversal due to extinguishment of put option	¥ (700,000)

REDEEMABLE NONCONTROLLING INTERESTS - Additional Information (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016	Dec. 31, 2015 tranche	May 31, 2014
Aipu Group
REDEEMABLE NONCONTROLLING INTERESTS
Percentage of equity interests acquired				50.00%
Number of tranches \| tranche			3
Business acquisition, equity interests held by non controlling interest holders maximum percentage of eligible shares to be put each year by option exercise right		11.00%	28.00%
Ownership percentage after transaction	50.00%
Aipu Group \| Floor
REDEEMABLE NONCONTROLLING INTERESTS
Financial and operational performance targeted amount used to compute put option exercise price	¥ 700,000
Aipu Group \| Ceiling
REDEEMABLE NONCONTROLLING INTERESTS
Financial and operational performance targeted amount used to compute put option exercise price	¥ 800,000
Aipu Group
REDEEMABLE NONCONTROLLING INTERESTS
Noncontrolling interest, ownership percentage		50.00%	50.00%

FAIR VALUE MEASUREMENTS - Assets and liabilities measured (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis	$ 69,436	¥ 483,394	¥ 1,441,976
Liabilities measured at fair value on recurring basis	431,445	3,003,639	2,035,331
Available-for-sales Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis	246	1,713	2,537
Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities measured at fair value on recurring basis	300,082	2,089,114	2,030,361
Liability Classified RSU
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities measured at fair value on recurring basis	303	2,109	4,970
Current portion of bonds payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities measured at fair value on recurring basis	131,060	912,416
Bank Time Deposits \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis	52,265	363,856	245,014
Bank Time Deposits \| Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis	$ 16,925	117,825	1,194,425
Quoted prices in active markets for identical assets and liabilities (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis		481,681	1,439,439
Liabilities measured at fair value on recurring basis		3,001,530	2,030,361
Quoted prices in active markets for identical assets and liabilities (Level 1) \| Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities measured at fair value on recurring basis		2,089,114	2,030,361
Quoted prices in active markets for identical assets and liabilities (Level 1) \| Current portion of bonds payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities measured at fair value on recurring basis		912,416
Quoted prices in active markets for identical assets and liabilities (Level 1) \| Bank Time Deposits \| Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis		363,856	245,014
Quoted prices in active markets for identical assets and liabilities (Level 1) \| Bank Time Deposits \| Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis		117,825	1,194,425
Unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis		1,713	2,537
Liabilities measured at fair value on recurring basis		2,109	4,970
Unobservable inputs (Level 3) \| Available-for-sales Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Assets measured at fair value on recurring basis		1,713	2,537
Unobservable inputs (Level 3) \| Liability Classified RSU
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Liabilities measured at fair value on recurring basis		¥ 2,109	¥ 4,970

FAIR VALUE MEASUREMENTS - Liabilities measured (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Business Acquisition Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance			¥ 36,734
Changes in the fair value			(13,905)
Business Acquisition Contingent Purchase Consideration \| Payment of cash consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Bonuses settled in cash during 2017			(22,829)
Liability Classified RSU
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning Balance		¥ 4,970	11,865
Reclassification to equity		(2,861)	(587)
Reversal			(6,308)
Ending Balance	$ 303	¥ 2,109	¥ 4,970

COMMITMENTS AND CONTINGENCIES - Capital and purchase commitments (Details) - Dec. 31, 2019 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Computer and Network Equipment and Construction in Progress \| Capital Commitments
Long-term Purchase Commitment [Line Items]
2020	$ 32,393	¥ 225,511
commitments to purchase	32,393	225,511
Bandwidth and Cabinet Capacity \| Purchase commitment
Long-term Purchase Commitment [Line Items]
2020	86,267	600,571
2021	8,705	60,602
2022	6,459	44,968
2023	30	206
2024 and thereafter	297	2,068
commitments to purchase	$ 101,758	¥ 708,415

COMMITMENTS AND CONTINGENCIES - Additional Information (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Apr. 09, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2012 CNY (¥)
COMMITMENTS AND CONTINGENCIES
Fair value of contingent consideration					¥ 47,755
Accrual for unrecognized tax benefits and interest	$ 351	¥ 2,443
Securities Litigation
COMMITMENTS AND CONTINGENCIES
Litigation settlement amount			¥ 58,808
Accrued liability for legal contingencies				¥ 10,007

SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
SUBSEQUENT EVENTS (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Dec. 31, 2019
Subsequent Event
Term of the notes		1 year
Subsequent Event \| Convertible Notes Payable [Member]
Subsequent Event
Total aggregate principal amount	$ 200,000
Term of the notes	5 years

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed balance sheets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Current assets
Cash and cash equivalents	$ 259,772	¥ 1,808,483	¥ 2,358,556	¥ 1,949,631
Restricted cash	68,786	478,873	265,214	¥ 242,494
Short-term investments	52,265	363,856	245,014
Prepaid expenses and other current assets	232,433	1,618,149	1,159,574
Amount due from a related party	43,331	301,665	125,446
Total current assets	750,982	5,228,184	4,678,109
Non-current assets
Total non-current assets	1,299,307	9,045,522	6,472,608
Total assets	2,050,289	14,273,706	11,150,717
Current liabilities:
Accrued expenses and other payables	140,613	978,935	659,320
Interest payable	8,469	58,961	54,376
Current portion of bonds payable	130,878	911,147
Total current liabilities	641,932	4,469,021	2,191,210
Non-current liabilities
Bonds payable	296,002	2,060,708	2,037,836
Total non-current liabilities	656,879	4,573,057	3,596,323
Total liabilities	1,298,811	9,042,078	5,787,533
Shareholders' equity:
Additional paid-in capital	1,321,866	9,202,567	9,141,494
Accumulated other comprehensive income	11,190	77,904	85,979
Accumulated deficit	(580,078)	(4,038,390)	(3,838,032)
Treasury stock	(50,206)	(349,523)	(337,683)
Total 21Vianet Group, Inc. shareholders' equity	711,466	4,953,073	5,094,207
Total liabilities and shareholders' equity	2,050,289	14,273,706	11,150,717
Parent Company
Current assets
Cash and cash equivalents	35,047	243,989	590,470
Short-term investments	19,944	138,848	150,990
Prepaid expenses and other current assets	15,168	105,597	98,337
Amounts due from subsidiaries	880,318	6,128,595	5,062,149
Total current assets	950,477	6,617,029	5,901,946
Non-current assets
Investments in subsidiaries	207,786	1,446,563	1,364,685
Total non-current assets	207,786	1,446,563	1,364,685
Total assets	1,158,263	8,063,592	7,266,631
Current liabilities:
Accrued expenses and other payables	8,275	57,612	56,656
Account payables	8	56	2,725
Interest payable	8,406	58,525	53,965
Current portion of bonds payable	130,878	911,147
Amounts due to subsidiaries	3,228	22,471	21,242
Total current liabilities	150,795	1,049,811	134,588
Non-current liabilities
Bonds payable	296,002	2,060,708	2,037,836
Total non-current liabilities	296,002	2,060,708	2,037,836
Total liabilities	446,797	3,110,519	2,172,424
Shareholders' equity:
Additional paid-in capital	1,321,866	9,202,567	9,141,494
Accumulated other comprehensive income	11,190	77,904	85,979
Accumulated deficit	(571,391)	(3,977,921)	(3,795,629)
Treasury stock	(50,206)	(349,523)	(337,683)
Total 21Vianet Group, Inc. shareholders' equity	711,466	4,953,073	5,094,207
Total liabilities and shareholders' equity	1,158,263	8,063,592	7,266,631
Class A Ordinary Shares
Shareholders' equity:
Ordinary shares	5	34	34
Class A Ordinary Shares \| Parent Company
Shareholders' equity:
Ordinary shares	5	34	34
Class B Ordinary Shares
Shareholders' equity:
Ordinary shares	2	12	12
Class B Ordinary Shares \| Parent Company
Shareholders' equity:
Ordinary shares	$ 2	¥ 12	¥ 12

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed balance sheets (Parenthetical) (Details) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Class A Ordinary Shares
Condensed balance sheets
Ordinary shares, par value (in dollars per share)	$ 0.00001	$ 0.00001
Ordinary shares, shares authorized (in shares)	1,200,000,000	1,200,000,000
Ordinary shares, shares issued (in shares)	505,253,850	499,706,628
Ordinary shares, shares outstanding (in shares)	505,253,850	499,706,628
Class B Ordinary Shares
Condensed balance sheets
Ordinary shares, par value (in dollars per share)	$ 0.00001	$ 0.00001
Ordinary shares, shares authorized (in shares)	300,000,000	300,000,000
Ordinary shares, shares issued (in shares)	174,649,638	174,649,638
Ordinary shares, shares outstanding (in shares)	174,649,638	174,649,638
Class C Ordinary Shares
Condensed balance sheets
Ordinary shares, par value (in dollars per share)	$ 0.00001	$ 0.00001
Ordinary shares, shares authorized (in shares)	60,000	0
Ordinary shares, shares issued (in shares)	60,000	0
Ordinary shares, shares outstanding (in shares)	60,000	0
Parent Company \| Class A Ordinary Shares
Condensed balance sheets
Ordinary shares, par value (in dollars per share)	$ 0.00001
Ordinary shares, shares authorized (in shares)	1,200,000,000	1,200,000,000
Ordinary shares, shares issued (in shares)	505,253,850	499,706,628
Ordinary shares, shares outstanding (in shares)	505,253,850	499,706,628
Parent Company \| Class B Ordinary Shares
Condensed balance sheets
Ordinary shares, par value (in dollars per share)	$ 0.00001
Ordinary shares, shares authorized (in shares)	300,000,000	300,000,000
Ordinary shares, shares issued (in shares)	174,649,638	174,649,638
Ordinary shares, shares outstanding (in shares)	174,649,638	174,649,638
Parent Company \| Class C Ordinary Shares
Condensed balance sheets
Ordinary shares, par value (in dollars per share)	$ 0.00001
Ordinary shares, shares authorized (in shares)	60,000	0
Ordinary shares, shares issued (in shares)	60,000	0
Ordinary shares, shares outstanding (in shares)	60,000	0

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION- Condensed statements of operations (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Operating Expenses
General and administrative expenses	$ (59,651)	¥ (415,277)	¥ (462,637)	¥ (519,950)
Changes in the fair value of contingent purchase consideration payables			13,905	(937)
Operating loss	26,176	182,234	237,479	(1,368,538)
Loss before income taxes	(25,252)	(175,809)	(162,325)	(1,007,814)
Income tax expenses	(781)	(5,437)	(24,411)	90,170
Net loss attributable to the Company's ordinary shareholders	(26,183)	(182,292)	(205,065)	(772,730)
Parent Company
Operating Expenses
General and administrative expenses	(6,389)	(44,490)	(65,949)	(145,890)
Changes in the fair value of contingent purchase consideration payables			13,905	(937)
Operating loss	(6,389)	(44,490)	(52,044)	(146,827)
Other loss	(39,440)	(274,572)	(262,186)	(95,210)
Loss before income taxes	(26,183)	(182,292)	(205,065)	(772,730)
Income tax expenses	0	0	0	0
Net loss attributable to the Company's ordinary shareholders	(26,183)	(182,292)	(205,065)	(772,730)
Parent Company \| Subsidiaries and Consolidated VIEs
Operating Expenses
Operating loss	$ 19,646	¥ 136,770	¥ 109,165	¥ (530,693)

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Statement of Comprehensive Loss (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Condensed statements of comprehensive loss
Net loss	$ (26,183)	¥ (182,292)	¥ (205,065)	¥ (772,730)
Other comprehensive (loss) income, net of tax of nil:
Comprehensive loss	(27,193)	(189,321)	(98,084)	(1,038,607)
Comprehensive loss attributable to the Company's ordinary shareholders	(27,343)	(190,367)	(116,413)	(893,693)
Parent Company
Condensed statements of comprehensive loss
Net loss	(26,183)	(182,292)	(205,065)	(772,730)
Other comprehensive (loss) income, net of tax of nil:
Foreign currency translation adjustments, net of tax of nil	(1,160)	(8,075)	88,652	(120,963)
Other comprehensive (loss) income, net of tax of nil:	(1,160)	(8,075)	88,652	(120,963)
Comprehensive loss	(27,343)	(190,367)	(116,413)	(893,693)
Comprehensive loss attributable to the Company's ordinary shareholders	$ (27,343)	¥ (190,367)	¥ (116,413)	¥ (893,693)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Statement of Comprehensive Loss (Parenthetical) (Details) - CNY (¥) ¥ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Condensed statements of comprehensive loss
Foreign currency translation adjustments, tax	¥ 0	¥ 0	¥ 0
Parent Company
Condensed statements of comprehensive loss
Other comprehensive (loss) income, tax	0	0	0	¥ 0
Foreign currency translation adjustments, tax	¥ 0	¥ 0	¥ 0

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Statements of Cash Flows (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Condensed Cash Flow Statements, Captions
Net cash used in operating activities	$ 115,332	¥ 802,922	¥ 704,966	¥ 487,202
Net cash used in investing activities	(231,550)	(1,611,983)	(304,846)	(833,307)
Net cash generated from (used in) financing activities	66,302	461,557	(19,901)	(612,651)
Net (decrease) increase in cash and cash equivalents and restricted cash	(43,645)	(303,844)	465,552	(1,099,054)
Cash and cash equivalents and restricted cash at beginning of the year	382,232	2,661,021	2,195,469	3,294,523
Cash and cash equivalents and restricted cash at end of the year	338,587	2,357,177	2,661,021	2,195,469
Parent Company
Condensed Cash Flow Statements, Captions
Net cash used in operating activities	(20,539)	(142,989)	(166,068)	(18,324)
Net cash used in investing activities	(145,258)	(1,011,257)	(203,651)	(1,291,042)
Net cash generated from (used in) financing activities	116,028	807,765	43,145	(130,187)
Net (decrease) increase in cash and cash equivalents and restricted cash	(49,769)	(346,481)	(326,574)	(1,439,533)
Cash and cash equivalents and restricted cash at beginning of the year	84,816	590,470	917,044	2,356,597
Cash and cash equivalents and restricted cash at end of the year	$ 35,047	¥ 243,989	¥ 590,470	¥ 917,044

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Related Party transactions (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Amount due from related parties current
Amount due from related parties current	$ 43,331	¥ 301,665	¥ 125,446
Amount due to related parties
Amounts due to related parties of the consolidated VIEs without resource to the primary beneficiaries	23,979	166,935	52,328
Parent Company
Amount due from subsidiaries current
Amount due from subsidiaries current	880,318	6,128,595	5,062,149
Amounts due to subsidiaries
Amount due to subsidiaries current	3,228	22,471	21,242
Parent Company \| 21Vianet Hong Kong Entities
Amount due from subsidiaries current
Amount due from subsidiaries current	841,083	5,855,452	4,938,618
Parent Company \| Hong Kong Fastweb Holdings Co., Limited ("Fastweb HK")
Amount due from subsidiaries current
Amount due from subsidiaries current	9,637	67,088	65,976
Parent Company \| 21Vianet Mobile Limited ("21V Mobile")
Amount due from subsidiaries current
Amount due from subsidiaries current	8,334	58,018	52,579
Parent Company \| WiFire Open Network Group Ltd
Amount due from subsidiaries current
Amount due from subsidiaries current	21,162	147,326	4,277
Parent Company \| WiFire Group Inc. ("WiFire Group")
Amount due from subsidiaries current
Amount due from subsidiaries current	100	698	686
Parent Company \| Other Subsidiaries
Amount due from subsidiaries current
Amount due from subsidiaries current	2	13	13
Amounts due to subsidiaries
Amount due to subsidiaries current	434	3,022	2,891
Parent Company \| Beijing 21Vianet Zhi Hui Neng Yuan System Technology Company Limited
Amounts due to subsidiaries
Amount due to subsidiaries current	$ 2,794	¥ 19,449	¥ 18,351

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Additional Information (Details) ¥ in Thousands, $ in Thousands							12 Months Ended
	Aug. 12, 2019 USD ($)	Apr. 16, 2019 USD ($)	Apr. 15, 2019 USD ($)	Apr. 15, 2019 CNY (¥)	Sep. 29, 2017 USD ($)	Aug. 17, 2017 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2017 CNY (¥)	Aug. 17, 2017 USD ($)
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Proceeds from issuance of Notes, net							$ 289,018	¥ 2,012,084	¥ 1,936,154
Loss on debt extinguishment							2,714	18,895
Bonds 7% Due 2020
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Debt instrument, face amount					$ 100,000					$ 200,000
Debt instrument, stated rate					7.00%					7.00%
Debt instrument, premium price					100.04
Debt instrument, effective yield					6.98%
Proceeds from issuance of Notes, net \| ¥						¥ 1,926,419
Principal amount repurchased	$ 18,000	$ 150,839
Total aggregate principal amount repurchased (as a percent)		50.28%
Outstanding principal amount	131,161
Bonds 7.875%, Due 2021
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Debt instrument, face amount			$ 300,000
Debt instrument, stated rate			7.875%
Proceeds from issuance of Notes, net			$ 283,903	¥ 1,976,474
Parent Company
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Loss on debt extinguishment							2,714	18,895
Parent Company \| Bonds 7% Due 2020
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Debt instrument, face amount					$ 100,000					$ 200,000
Debt instrument, stated rate					7.00%					7.00%
Debt instrument, maturity date					Aug. 17, 2020
Debt instrument, frequency of periodic payment					Notes is payable semi-annually in arrears on August 17 and February 17 in each year
Debt instrument, date of first required payment					Feb. 17, 2018
Debt instrument, premium price					100.04
Debt instrument, effective yield					6.98%
Proceeds from issuance of Notes, net \| ¥								1,926,419
Principal amount repurchased	$ 18,000	$ 150,839
Total aggregate principal amount repurchased (as a percent)		50.28%
Outstanding principal amount							131,161
Parent Company \| Bonds 7.875%, Due 2021
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION
Debt instrument, face amount			$ 300,000
Debt instrument, stated rate			7.875%
Debt instrument, frequency of periodic payment			Notes is payable semi-annually in arrears on April 15 and October 15 in each year	Notes is payable semi-annually in arrears on April 15 and October 15 in each year
Debt instrument, date of first required payment			Oct. 15, 2019	Oct. 15, 2019
Proceeds from issuance of Notes, net							$ 283,903	¥ 1,976,474