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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Significant Risks and Uncertainties) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) customer	Dec. 31, 2016 CNY (¥) customer	Dec. 31, 2015 CNY (¥) customer	Dec. 31, 2014 CNY (¥)	Dec. 31, 2016 CNY (¥)
Significant Risks and Uncertainties
Cash and cash equivalents	$ 139,453		¥ 846,120	¥ 1,378	¥ 968,225
Net revenue	$ 466,368	¥ 3,237,991	1,313,639	196,525
Cash and cash equivalents | Foreign currency risk | RMB
Significant Risks and Uncertainties
Cash and cash equivalents			347,506		¥ 564,240
Representing greater than 10% of total net revenue from single customer | Customer concentration risk
Significant Risks and Uncertainties
Net revenue		¥ 0	¥ 0	¥ 0
Representing greater than 10% of accounts receivable | Customer concentration risk
Significant Risks and Uncertainties
Number of customers | customer	0	0	0

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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