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SHARE INCENTIVE PLAN (Tables) | 12 Months Ended
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Dec. 31, 2018
SHARE INCENTIVE PLAN |
Summary of stock option activity |
|  | Number |  | Weighted |  | Weighted average |  | Weighted average |  | Aggregate
|  | of options |  | average |  | grant-date |  | remaining contractual |  | intrinsic
|  | outstanding |  | exercise price |  | fair value per option |  | term (years) |  | value
Options outstanding at January 1, 2016 |  | 2,566,256 |  | 2.15 |  | 1.02 |  | 5.52 |  | 4,639
Forfeited |  | (29,300) |  | 1.76 |  | 0.41 |  | — |  | —
Options outstanding at December 31, 2016 |  | 2,536,956 |  | 2.15 |  | 1.03 |  | 4.53 |  | 15,281
Granted |  | 2,109,305 |  | 11.42 |  | 5.75 |  | — |  | —
Exercised |  | (550,000) |  | 1.08 |  | 0.22 |  | — |  | —
Forfeited |  | (17,000) |  | 2.32 |  | 0.79 |  | — |  | —
Options outstanding at December 31, 2017 |  | 4,079,261 |  | 7.09 |  | 3.57 |  | 6.91 |  | 51,117
Granted |  | 20,000 |  | 0.01 |  | 17.39 |  | 9.26 |  | 117
Forfeited |  | (42,250) |  | 11.66 |  | 5.34 |  | — |  | —
Options outstanding at December 31, 2018 |  | 4,057,011 |  | 7.00 |  | 3.62 |  | 5.93 |  | 10,337
Options exercisable at December 31, 2018 |  | 3,517,781 |  | 6.36 |  | 3.09 |  | 5.53 |  | 10,220
Schedule of fair value assumptions |
Grant date |  | June 22, 2017 |  | July 1, 2017 |  | April 2, 2018 |
Risk-free interest rate |  | 2.15 | % | 2.31 | % | 2.73 | %
Expected volatility |  | 40 | % | 40 | % | 38 | %
Expected dividend yield |  | 0 | % | 0 | % | 0 | %
Exercise multiples |  | 2.8/2.2 |  | 2.8/2.2 |  | 2.2 |
Fair value of underlying ordinary share |  | 11.67 |  | 11.67 |  | 17.40 |
Summary of nonvested shares |
|  | Number |  | Weighted |  |
|  | of nonvested shares |  | average grant date |  | Aggregate
|  | outstanding |  | fair value |  | intrinsic value
Nonvested shares outstanding at December 31, 2016 and 2017 |  | — |  |  |  |
Granted |  | 218,000 |  |  |  |
Nonvested shares outstanding at December 31, 2018 |  | 218,000 |  | 20.16 |  | 1,273
Nonvested shares vested and expected to vest at December 31, 2018 |  | 218,000 |  | 20.16 |  | 1,273

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