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SHARE-BASED COMPENSATION - 2011 SHARE AWARD SCHEME (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
May. 26, 2011 USD ($) shares | Dec. 31, 2015 USD ($) employee $ / shares shares | Dec. 31, 2015 CNY (¥) employee shares | Dec. 31, 2014 $ / shares shares | Dec. 31, 2014 CNY (¥) shares | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥) ¥ / shares shares
Other disclosures |  |  |  |  |  |  |
Share-based compensation expenses |  | $ 48,690,000 | ¥ 315,407 |  | ¥ 173,274 | ¥ 37,396 |
2011 Share Award Scheme |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Award scheme term | 10 years |  |  |  |  |  |
Aggregate consideration to repurchase vested shares | $ | $ 1,000 |  |  |  |  |  |
Shares available to be granted in the future |  | 1,273,840 |  | 5,270,620 | 5,270,620 |  | 1,273,840
Other disclosures |  |  |  |  |  |  |
Share-based compensation expenses |  | $ 11,197,000 | ¥ 72,535 |  | ¥ 41,259 | 35,527 |
2011 Share Award Scheme | Maximum |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Number of shares subject to award | 100,000,000 |  |  |  |  |  |
2011 Share Award Scheme | Restricted shares |  |  |  |  |  |  |
Number of ordinary shares |  |  |  |  |  |  |
Unvested at beginning of year |  | 38,398,753 | 38,398,753 |  |  |  |
Number of restricted shares granted |  | 6,380,530 | 6,380,530 |  |  |  |
Vested |  | (20,192,560) | (20,192,560) |  |  |  |
Forfeited |  | (2,383,750) | (2,383,750) |  |  |  |
Unvested at end of year |  | 22,202,973 | 22,202,973 |  | 38,398,753 |  |
Weighted average grant date fair value |  |  |  |  |  |  |
Unvested at beginning of year (in dollars per share) | $ / shares |  | $ 0.55 |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | 1.91 |  |  |  |  |
Vested (in dollars per share) | $ / shares |  | 0.36 |  |  |  |  |
Forfeited (in dollars per share) | $ / shares |  | 0.63 |  |  |  |  |
Unvested at end of year (in dollars per share) | $ / shares |  | $ 1.11 |  | $ 0.55 |  |  |
Other disclosures |  |  |  |  |  |  |
Unrecognized compensation costs |  | $ 10,587,000 |  |  |  |  | ¥ 68,582
Expected period over which unamortized compensation costs is to be recognized |  | 1 year 11 months 1 day | 1 year 11 months 1 day |  |  |  |
Total fair value of vested shares |  | $ 46,577,000 | ¥ 301,715 |  | ¥ 243,214 | ¥ 74,962 |
2011 Share Award Scheme | Restricted shares with repurchase options |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Repurchase price of vested shares (in dollar pers share) | ¥ / shares |  |  |  |  |  |  | ¥ 4
Redemption right liability |  | 73,000 | 474 |  | ¥ 520 |  |
Change in fair value of redemption right recorded as share-based compensation costs. |  | 4,000 | 24 |  |  |  |
Other disclosures |  |  |  |  |  |  |
Share-based compensation expenses |  | $ 3,000 | ¥ 22 |  |  |  |
2011 Share Award Scheme | Restricted shares with repurchase options | Maximum |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Requisite service period |  | 4 years | 4 years |  |  |  |
2011 Share Award Scheme | Restricted shares with repurchase options | Minimum |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Requisite service period |  | 1 year | 1 year |  |  |  |
2011 Share Award Scheme | Restricted shares with repurchase options | Employees |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Number of employees | employee |  | 2 | 2 |  |  |  |
Number of ordinary shares |  |  |  |  |  |  |
Number of restricted shares granted |  | 3,000,000 | 3,000,000 |  |  |  |

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