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SHARE-BASED COMPENSATION - Share-based compensation expenses (Details) - CNY (¥) ¥ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
SHARE-BASED COMPENSATION
Compensation expense	¥ 41,394	¥ 57,187
Cost of revenue
SHARE-BASED COMPENSATION
Compensation expense	7,365	1,169
Selling and marketing expenses
SHARE-BASED COMPENSATION
Compensation expense	12,779	5,159
General and administrative expenses
SHARE-BASED COMPENSATION
Compensation expense	20,842	¥ 50,859
Research and development expenses
SHARE-BASED COMPENSATION
Compensation expense	¥ 408

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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