STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock Options Valuation Assumptions

The assumptions that the Company used to determine the grant-date fair value of options granted were as follows, presented on a weighted-average basis:

	December 31,
	2020		2019
Risk-free interest rate	0.91	%	1.68	%
Expected term (in years)	6.1		6.0
Expected volatility	63.8	%	62.2	%
Expected dividend yield	0	%	0	%

Schedule of Stock Option Activity

The following table summarizes the stock option activity under the Company’s equity awards plans:

	Options	Weighted Average Exercise Price		Weighted Average Remaining Life (in Years)	Intrinsic Value (in thousands)
Outstanding December 31, 2019	2,378,474	$	8.03	9.7	$	6,722
Granted	1,574,543	$	26.10
Exercised	(160,509)	$	6.85
Canceled or forfeited	(39,764)	$	4.11
Outstanding December 31, 2020	3,752,744	$	15.71	9.0	$	62,842
Options vested or expected to vest at December 31, 2020	3,752,744	$	15.71	9.0	$	62,842
Options exercisable at December 31, 2020	706,696	$	7.67	8.6	$	17,226

Schedule of Restricted Stock Activity

The following table summarizes restricted stock activity since January 1, 2019:

	Number of shares	Weighted average grant date fair value
Unvested restricted common stock as of January 1, 2019	132,645	$	0.51
Granted	62,988	$	5.22
Vested	(195,633)	$	5.94
Unvested restricted common stock as of December 31, 2019	—	$	—
Granted	61,000	$	29.65
Vested	(6,664)	$	30.00
Unvested restricted common stock as of December 31, 2020	54,336	$	29.68

Schedule of Stock-Based Compensation

The Company recorded stock-based compensation expense related to stock options and restricted stock units in the following expense categories of its consolidated statements of operations and comprehensive loss:

	December 31,
	2020		2019
Research and development	$	3,607	$	3,171
General and administrative	4,158		472
	$	7,765	$	3,643