STOCK BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of stock-based compensation expense

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Research and development	$	295	$	267	$	539	$	490
General and administrative		499		554		928		1,009
Selling and Marketing		65		26		118		79
Total	$	859	$	847	$	1,585	$	1,578

Schedule of stock option activity

	Number of Shares			Weighted- Average Exercise Prices per Share		Weighted- Average Remaining Contractual Term (In Years)		Intrinsic Value
Outstanding at January 1, 2022		2,869		$	6.64
Granted		175		$	14.54
Exercised		(26	)	$	6.55
Forfeited		(3	)	$	28.66
Expired		(7	)	$	33.09
Outstanding at June 30, 2022		3,008		$	7.01		5.6	$	9,419
Exercisable at June 30, 2022		2,454		$	6.37		4.9	$	7,809

Schedule of restricted stock option activity

	Number of Shares			Weighted-Average Grant Date Fair Value per Share
Outstanding at January 1, 2022		386		$	6.75
Granted		194		$	14.41
Vested		(124	)	$	7.62
Outstanding non-vested shares at June 30, 2022		456		$	9.77