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SHARE-BASED COMPENSATION - 2013 INCENTIVE SCHEME (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 02, 2014 shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2014 CNY (¥) shares | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥) shares
Other disclosures |  |  |  |  |  |  |
Share-based compensation expenses |  | $ 48,690 | ¥ 315,407 |  | ¥ 173,274 | ¥ 37,396 |
2013 Incentive Scheme |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Number of shares subject to award | shares | 64,497,718 |  |  |  |  |  |
Award scheme term | 10 years |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |
Share-based compensation expenses |  | $ 21,523 | ¥ 139,422 |  | ¥ 126,399 | ¥ 0 |
Restricted shares with an option feature | 2013 Incentive Scheme |  |  |  |  |  |  |
Number of shares |  |  |  |  |  |  |
Outstanding at the beginning of the year | shares |  | 55,292,131 | 55,292,131 |  |  |  |
Granted | shares |  | 11,005,000 | 11,005,000 |  |  |  |
Forfeited | shares |  | (3,087,000) | (3,087,000) |  |  |  |
Exercised | shares |  | (1,889,800) | (1,889,800) |  |  |  |
Outstanding at the end of the year | shares |  | 61,320,331 | 61,320,331 |  | 55,292,131 |  |
Vested and expected to vest at end of year | shares |  | 59,733,636 | 59,733,636 |  |  |  |
Exercisable | shares |  | 10,023,493 |  |  |  |  | 10,023,493
Weighted Average Exercise Price |  |  |  |  |  |  |
Outstanding at the beginning of the year (in dollars per share) |  | $ 0.34 |  |  |  |  |
Granted (in dollars per share) |  | 0.31 |  |  |  |  |
Forfeited (in dollars per share) |  | (0.34) |  |  |  |  |
Exercised (in dollors per share) |  | 0.34 |  |  |  |  |
Outstanding at the end of the year (in dollars per share) |  | 0.33 |  | $ 0.34 |  |  |
Vested and expected to vest at end of year (in dollars per share) |  | 0.33 |  |  |  |  |
Exercisable at end of year (in dollars per share) |  | 0.33 |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) |  | 1.03 |  |  |  |  |
Granted (in dollars per share) |  | 2.16 |  |  |  |  |
Forfeited (in dollars per share) |  | 1.25 |  |  |  |  |
Exercised (in dollars per share) |  | 0.93 |  |  |  |  |
Outstanding at end of year (in dollars per share) |  | 1.23 |  | $ 1.03 |  |  |
Vested and expected to vest at the end of the year (in dollars per share) |  | 1.22 |  |  |  |  |
Exercisable (in dollars per share) |  | $ 1.09 |  |  |  |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |
Outstanding |  | 8 years 4 days | 8 years 4 days |  | 9 years 4 days |  |
Vested and expected to vest |  | 8 years 4 days | 8 years 4 days |  |  |  |
Exercisable |  | 8 years 4 days | 8 years 4 days |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |
Outstanding | $ |  | $ 77,726 |  | $ 64,802 |  |  |
Vested and expected to vest at the end of the year | $ |  | 75,704 |  |  |  |  |
Exercisable | $ |  | 12,752 |  |  |  |  |
Exercised |  | $ 4,108 | ¥ 26,613 |  |  |  |
Fair Value Assumptions |  |  |  |  |  |  |
Risk-free interest rates, minimum |  | 2.40% | 2.40% |  |  |  |
Risk-free interest rates, maximum |  | 2.99% | 2.99% |  |  |  |
Expected volatility range, minimum |  | 52.60% | 52.60% |  |  |  |
Expected volatility range, maximum |  | 63.80% | 63.80% |  |  |  |
Other disclosures |  |  |  |  |  |  |
Unrecognized compensation costs |  | $ 32,489 |  |  |  |  | ¥ 210,455
Expected period over which unamortized compensation costs is to be recognized |  | 2 years 4 months 28 days | 2 years 4 months 28 days |  |  |  |
Maximum | 2013 Incentive Scheme |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |  |
Maximum | Restricted shares with an option feature | 2013 Incentive Scheme |  |  |  |  |  |  |
Fair Value Assumptions |  |  |  |  |  |  |
Fair value of ordinary share (in dollars per share) |  | $ 2.87 |  |  |  |  |
Expected exercise multiple |  | 2.2 | 2.2 |  |  |  |
Fair value per option granted (in dollars pers share) |  | $ 2.58 |  |  |  |  |
Minimum | Restricted shares with an option feature | 2013 Incentive Scheme |  |  |  |  |  |  |
Fair Value Assumptions |  |  |  |  |  |  |
Fair value of ordinary share (in dollars per share) |  | 1.45 |  |  |  |  |
Fair value per option granted (in dollars pers share) |  | $ 1.16 |  |  |  |  |
Class A Ordinary shares |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |
Ordinary shares, shares issued | shares |  | 365,961,759 |  | 288,988,560 |  |  | 365,961,759
Ordinary shares outstanding for exercised share awards | shares |  | 350,398,737 |  | 260,045,912 |  |  | 350,398,737
Class A Ordinary shares | 2013 Incentive Scheme |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |
Ordinary shares, shares issued | shares |  | 1,890,800 |  | 1,000 |  |  | 1,890,800
Ordinary shares outstanding for exercised share awards | shares |  | 1,890,800 |  | 1,000 |  |  | 1,890,800

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- Definition Net number of non-option equity instruments granted to participants. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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