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SHARE-BASED COMPENSATION - Share-based compensation expenses (Details) - CNY (¥) ¥ in Thousands | 9 Months Ended
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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 + Details
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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. + Details
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