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INCOME TAXES - RECONCILIATION OF UNRECOGNIZED TAX BENEFIT (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2015 CNY (¥)
Unrecognized tax benefits
Amount of unrecognized tax benefits that if recognized would impact the annual effective tax rate	$ 2,573		¥ 7,073	¥ 16,667
Unrecognized tax benefit net against deferred tax loss carryforwards	4,623	¥ 29,948	8,973
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning	2,477	16,046	3,212
Additions based on tax positions related to the current year	4,719	30,569	12,834
Balance, ending	7,196	46,615	16,046
Interest related to unrecognized tax benefits	98	638	755
Penalties related to unrecognized tax benefits		¥ 0	0
Interest accrued related to unrecognized tax benefits	$ 231		¥ 856	¥ 1,494

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns net against deferred tax assets related to tax loss carryforwards.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
-Paragraph 15
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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