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SHARE-BASED COMPENSATION - Option activity (Details) - ¥ / shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Number of options |  |
Options outstanding at January 1, 2017 (in shares) | 28,589,782 |
Granted (in shares) | 166,667 |
Exercise of share options (in shares) | (376,984) |
Forfeited (in shares) | (19,000) |
Options outstanding at September 30, 2017 (in shares) | 28,360,465 |
Weighted average exercise price |  |
Options outstanding at January 1, 2017 (in RMB per share) | ¥ 5.2 |
Granted (in RMB per share) | 5.3 |
Exercised (in RMB per share) | 5.2 |
Forfeited (in RMB per share) | 5.2 |
Options outstanding at September 30, 2017 (in RMB per share) | 5.2 |
Weighted average grant-date fair value per option |  |
Options outstanding at January 1, 2017 (in RMB per share) | 3.2 |
Granted (in RMB per share) | 7.6 |
Exercised (in RMB per share) | 1.9 |
Forfeited (in RMB per share) | 1.9 |
Options outstanding at September 30, 2017 (in shares) | ¥ 3.2 |
Options vested and expect to vest |  |
Number of options | 28,360,465 |
Weighted average exercise price (in RMB per share) | ¥ 5.2 |
Weighted average grant-date fair value per option (in RMB per share) | ¥ 3.2 |
Stock options outstanding and stock options exercisable |  |
Number of shares | 28,360,465 |
Weighted average remaining contractual life (years) | 2 years 6 months |
Weighted average exercise price (in RMB per share) | ¥ 5.2 |
Employee stock options |  |
Other disclosures |  |
Forfeitable and unvested (in shares) | 0 |
Non-employee options |  |
Other disclosures |  |
Forfeitable and unvested (in shares) | 433,333 | 600,000

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- Definition The weighted average grant-date fair value of options forfeited during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition As of the balance sheet date, weighted average grant-date fair value of options vested and expected to vest. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options outstanding at the reporting date as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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