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SHARE INCENTIVE PLAN (Tables)

12 Months Ended

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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Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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