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SHARE BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2016
SHARE BASED COMPENSATION [Abstract] |
Summary of Stock Option Activity |
|  |  |  |  |  | Weighted |  |  |
|  |  |  | Weighted |  | Average |  |  |
|  | Number of |  | Average |  | Remaining |  | Aggregate |
|  | Share |  | Exercise Price |  | Contractual |  | Intrinsic |
|  | Options |  | US$ |  | Years |  | Value US$ |
Outstanding at December 31, 2013 |  |  | 8,134,830 |  |  | 0.82 |  |  |  |  |  |  |
Granted |  |  | 1,805,784 |  |  | 3.05 |  |  |  |  |  |  |
Exercised |  |  | (1,786,449) |  |  | 0.14 |  |  |  |  |  |  |
Forfeited |  |  | (115,215) |  |  | 2.91 |  |  |  |  |  |  |
Expired |  |  | — |  |  | — |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 8,038,950 |  |  | 1.44 |  |  | 6.19 |  |  | 77,658 |
Granted |  |  | 615,624 |  |  | 3.38 |  |  |  |  |  |  |
Exercised |  |  | (3,015,872) |  |  | 1.20 |  |  |  |  |  |  |
Forfeited |  |  | (56,926) |  |  | 3.33 |  |  |  |  |  |  |
Expired |  |  | — |  |  | — |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 5,581,776 |  |  | 1.77 |  |  | 5.68 |  |  | 48,412 |
Granted |  |  | 1,115,807 |  |  | 1.90 |  |  |  |  |  |  |
Exercised |  |  | (2,106,043) |  |  | 1.46 |  |  |  |  |  |  |
Forfeited |  |  | (263,671) |  |  | 2.98 |  |  |  |  |  |  |
Expired |  |  | — |  |  | — |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 4,327,869 |  |  | 1.88 |  |  | 5.84 |  |  | 56,743 |
Vested and expected to vest as of December 31, 2016 |  |  | 3,959,763 |  |  | 1.74 |  |  | 5.59 |  |  | 52,460 |
Exercisable as of December 31, 2016 |  |  | 2,536,418 |  |  | 1.17 |  |  | 4.09 |  |  | 35,045 |
Summary of Fair Value Assumptions |
|  | Year Ended December 31, |
|  | 2014 |  | 2015 |  | 2016 |
|  | US$ |  | US$ |  | US$ |
Expected volatility |  |  | 51.7% |  |  | 62.3%-70.9% |  |  | 63.5%-68.8% |
Expected dividends yield |  |  | 0% |  |  | 0% |  |  | 0% |
Exercise multiple |  |  | 2.2 |  |  | 2.0 |  |  | 2.0 |
Risk-free interest rate per annum |  |  | 3.81% |  |  | 2.68%-2.99% |  |  | 2.15%-3.18% |
Estimated fair value of underlying ordinary shares (per share) |  |  | US$8.60 |  |  | US$9.28-US$12.85 |  |  | US$9.99-US$16.54 |
Schedule of Fair Values of the Options Granted |
|  | Year Ended December 31, |
|  | 2014 |  | 2015 |  | 2016 |
|  | US$ |  | US$ |  | US$ |
Weighted average grant date fair value of option per share |  |  | 6.35 |  |  | 9.16 |  |  | 10.17 |
Aggregate grant date fair value of options |  |  | 11,468 |  |  | 5,641 |  |  | 11,352 |
Summary of Non-vested Shares Activity |
|  |  |  | Weighted Average |
|  | Number of Non- |  | Grant Date Fair |
|  | vested Shares |  | Value |
|  |  |  | US$ |
Outstanding as of December 31, 2013 |  |  | - |  |  | - |
Granted |  |  | 29,724 |  |  | 9.38 |
Vested |  |  | (1,944) |  |  | 13.95 |
Forfeited |  |  | - |  |  | - |
Outstanding as of December 31, 2014 |  |  | 27,780 |  |  | 9.06 |
Granted |  |  | 25,000 |  |  | 9.63 |
Vested |  |  | (27,780) |  |  | 9.06 |
Forfeited |  |  | - |  |  | - |
Outstanding as of December 31, 2015 |  |  | 25,000 |  |  | 9.63 |
Granted |  |  | 20,000 |  |  | 10.82 |
Vested |  |  | (35,000) |  |  | 9.97 |
Forfeited |  |  | - |  |  | - |
Outstanding as of December 31, 2016 |  |  | 10,000 |  |  | 10.82 |

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