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Organization (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Summary of Subsidiaries and Consolidated Variable Interest Entities | The Company is 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, 2017 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
21 Vianet Zhuhai Financial Leasing Co., Ltd (“Zhuhai Financial Leasing”) |  | April 9, 2015 |  | PRC |  |  | 100 | % |  | Provision of financial leasing business services
21Vianet DRP Investment Holdings Limited. (“DRP investment”) |  | January 10, 2017 |  | Hong Kong |  |  | 100 | % |  | Investment holding
Shihua DC Investment Holdings Limited. (“Shihua Investment”) |  | March 14, 2017 |  | Cayman |  |  | 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 Date Co., Ltd. (“FS Zhuoyi”) (1) /(4) |  | July 7, 2016 |  | PRC |  |  | 51 | % |  | Dormant company
Dermot Holding Limited (“Dermot BVI”) (3) |  | August 8, 2014 |  | British Virgin Islands |  |  | 100 | % |  | Investment holding
Variable Interest Entities (the “VIEs”): |  |  |  |  |  |  |  |
Beijing Yiyun Network Technology Co., Ltd. (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. (1) / (2) |  | April 1, 2014 |  | PRC |  |  | — |  |  | Provision of telecommunication services
Held directly by BJ iJoy: |  |  |  |  |  |  |  |  |  |
Shanghai iJoy Information Technology Co., Ltd. (“SH iJoy”) (1) / (2) |  | May 30, 2013 |  | PRC |  |  | — |  |  | Provision of internet data center, content delivery network 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 Yilong Xinda Technology Co., Ltd. (“BJ Yilong”) (1) / (2) |  | February 28, 2013 |  | PRC |  |  | — |  |  | Provision of managed network services and virtual private network services
Beijing Yichengtaihe Investment Co., Ltd. (“BJ Yichengtaihe”) (1)/ (2) |  | September 30, 2014 |  | PRC |  |  | — |  |  | Provision of internet data center services
Beijing Hongyuan Network Technology Co., Ltd. (“BJ Hongyuan”) (1)/ (2) |  | December 8, 2014 |  | 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 Dermot BVI and its subsidiaries (collectively referred to as “Dermot Entities”).
(4) | On July 7, 2016, the Company through its subsidiary, 21Vianet HK acquired 100% equity interest in the entity, which was accounted for an assets acquisition.
Consolidated VIE before Eliminating Intercompany Balances | The following tables represent the financial information of the Consolidated VIEs as of December 31, 2016 and 2017 and for the years ended December 31, 2015, 2016 and 2017 before eliminating the intercompany balances and transactions between the Consolidated VIEs and other entities within the Company :
|  | As of December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 239,874 |  |  |  | 233,673 |  |  |  | 35,915 |
Restricted cash |  |  | 68,709 |  |  |  | 149,375 |  |  |  | 22,959 |
Accounts receivable (net of allowance for doubtful debt of RMB80,313 and RMB70,627 (US$10,855) as of December 31, 2016 and 2017, respectively) |  |  | 555,509 |  |  |  | 342,276 |  |  |  | 52,607 |
Inventories |  |  | 4,320 |  |  |  | — |  |  |  | — |
Prepaid expenses and other current assets |  |  | 636,776 |  |  |  | 809,546 |  |  |  | 124,425 |
Amounts due from related parties |  |  | 82,350 |  |  |  | 86,824 |  |  |  | 13,345 |
Total current assets |  |  | 1,587,538 |  |  |  | 1,621,694 |  |  |  | 249,251 |
Non-current assets: |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, net |  |  | 2,501,578 |  |  |  | 2,331,139 |  |  |  | 358,290 |
Intangible assets, net |  |  | 555,649 |  |  |  | 45,203 |  |  |  | 6,948 |
Land use rights, net |  |  | 76,044 |  |  |  | 74,162 |  |  |  | 11,398 |
Goodwill |  |  | 1,146,570 |  |  |  | 302,956 |  |  |  | 46,563 |
Deferred tax assets |  |  | 97,063 |  |  |  | 169,224 |  |  |  | 26,009 |
Other non-current assets |  |  | 112,822 |  |  |  | 67,517 |  |  |  | 10,377 |
Long-term investments |  |  | 266,748 |  |  |  | 355,894 |  |  |  | 54,700 |
Total non-current assets |  |  | 4,756,474 |  |  |  | 3,346,095 |  |  |  | 514,285 |
Total assets |  |  | 6,344,012 |  |  |  | 4,967,789 |  |  |  | 763,536 |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Short-term bank borrowings |  |  | 183,676 |  |  |  | 50,000 |  |  |  | 7,685 |
Accounts and notes payable |  |  | 441,847 |  |  |  | 157,970 |  |  |  | 24,280 |
Accrued expenses and other payables |  |  | 525,613 |  |  |  | 368,190 |  |  |  | 56,590 |
Advance from customers |  |  | 201,397 |  |  |  | 403,244 |  |  |  | 61,977 |
Deferred revenue |  |  | 311,191 |  |  |  | 49,699 |  |  |  | 7,639 |
Income tax payable |  |  | 25,466 |  |  |  | 7,400 |  |  |  | 1,137 |
Amount due to inter-companies (1) |  |  | 1,221,897 |  |  |  | 1,863,780 |  |  |  | 286,458 |
Amount due to related parties (Note 23) |  |  | 53,295 |  |  |  | 16,053 |  |  |  | 2,467 |
Current portion of capital lease obligation |  |  | 203,394 |  |  |  | 201,315 |  |  |  | 30,942 |
Current portion of long-term bank borrowings |  |  | 12,564 |  |  |  | 70,289 |  |  |  | 10,803 |
Deferred government grants |  |  | 5,107 |  |  |  | 4,574 |  |  |  | 703 |
Total current liabilities |  |  | 3,185,447 |  |  |  | 3,192,514 |  |  |  | 490,681 |
|  | As of December 31, |
|  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | US$ |
Non-current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Amount due to inter-companies (1) |  |  | 1,052,734 |  |  |  | 1,020,972 |  |  |  | 156,921 |
Long-term bank borrowings |  |  | 219,055 |  |  |  | 187,638 |  |  |  | 28,839 |
Deferred revenue |  |  | 62,531 |  |  |  | — |  |  |  | — |
Non-current portion of capital lease obligations |  |  | 581,568 |  |  |  | 687,176 |  |  |  | 105,617 |
Unrecognized tax benefits |  |  | 24,153 |  |  |  | 13,225 |  |  |  | 2,033 |
Deferred tax liabilities |  |  | 182,877 |  |  |  | 109,339 |  |  |  | 16,805 |
Deferred government grants |  |  | 25,886 |  |  |  | 17,861 |  |  |  | 2,745 |
Total non-current liabilities |  |  | 2,148,804 |  |  |  | 2,036,211 |  |  |  | 312,960 |
Total liabilities |  |  | 5,334,251 |  |  |  | 5,228,725 |  |  |  | 803,641 |
|  | For the Years Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Net revenues |  |  | 3,066,090 |  |  |  | 2,938,319 |  |  |  | 2,578,893 |  |  |  | 396,369 |
Net loss |  |  | (35,811 | ) |  |  | (674,685 | ) |  |  | (567,395 | ) |  |  | (87,207 | )
|  | For the Years Ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Net cash provided by operating activities |  |  | 270,358 |  |  |  | 141,364 |  |  |  | 364,246 |  |  |  | 55,984 |
Net cash provided by (used in) investing activities |  |  | 105,635 |  |  |  | (470,955 | ) |  |  | (601,368 | ) |  |  | (92,429 | )
Net cash (used in) provided by financing activities |  |  | (354,408 | ) |  |  | 178,283 |  |  |  | 230,921 |  |  |  | 35,492 |
Net increase (decrease) in cash and cash equivalents |  |  | 21,585 |  |  |  | (151,308 | ) |  |  | (6,201 | ) |  |  | (953 | )
| (1) | Amount due to inter-companies consist of intercompany payables to the other companies within the Company for the purchase of telecommunication resources and fixed assets on behalf of the Consolidated VIEs.

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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6228884-111685 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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