SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

Share-Based Compensation Awards

Schedule of common stock options issued and outstanding

						Weighted
		Weighted		Aggregate		average
		average		intrinsic		remaining
		exercise		value		contractual
	Options	price		(in thousands)		life (years)
Outstanding and expected to vest at December 31, 2018	3,357,873	$	7.74	$	43,224	7.90
Granted	648,000	$	25.88
Outstanding and expected to vest at December 31, 2019	4,005,873	$	10.67	$	82,944	7.34
Exercisable at December 31, 2019	2,495,433	$	5.31	$	64,738	6.41

Schedule of restricted stock units issued and outstanding

	Restricted Stock Units
Outstanding and expected to vest at December 31, 2018	—
Granted	10,296
Outstanding and expected to vest at December 31, 2019	10,296

Employees

Share-Based Compensation Awards

Schedule of assumptions that Company used to determine the fair value of the stock options granted

	Year Ended		Year Ended
	December 31, 2019		December 31, 2018
Risk-free interest rate	1.78	%	2.89	%
Expected term (in years)	6.3		6.3
Expected volatility	60.6	%	57.8	%
Expected dividend yield	—	%	—	%

Nonemployees

Share-Based Compensation Awards

Schedule of assumptions that Company used to determine the fair value of the stock options granted

	Year Ended
	December 31, 2018
Risk-free interest rate	3.00	%
Expected term (in years)	10.0
Expected volatility	62.7	%
Expected dividend yield	—	%