EMPLOYEE EQUITY-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Option Activity under the Company's Equity-Based Compensation

The following table summarizes option activity under the Company's equity-based compensation plans for the three months ended March 31, 2023:

	Number of Shares	Weighted Average Exercise Price per Share
Options outstanding January 1, 2023	5,408,661	$	14.60
Granted	100,000	0.51
Forfeited	(99,934)	8.15
Exercised	—	—
Expired	(132,874)	13.15
Options outstanding March 31, 2023	5,275,853	$	14.49

Schedule of Outstanding Options and Options that are Exercisable (Vested)

The following table shows summary information for outstanding options and options that are exercisable (vested) as of March 31, 2023:

	Options Outstanding		Options Exercisable
Number of options	5,275,853		4,422,198
Weighted average remaining contractual term (in years)	4.62		4.06
Weighted average exercise price	$	14.49	$	15.37
Weighted average fair value	$	9.01	$	9.50
Aggregate intrinsic value (in thousands)	$	20	$	—

Schedule of Restricted Stock Activity

The following table summarizes RSU and restricted stock award activity for the three months ended March 31, 2023:

	Number of Shares	Weighted Average Grant Date Fair Value per Share
Outstanding January 1, 2023	4,355,420	$	4.29
Granted	1,833,230	0.62
Forfeited	(695,050)	4.30
Released	(2,150,702)	1.88
Outstanding March 31, 2023	3,342,898	$	3.82

Schedule of Equity-Based Compensation Expense

The table below summarizes equity-based compensation expense for the three months ended March 31, 2023 and 2022 (in thousands):

	Three Months Ended March 31,
	2023		2022
Cost of sales	$	90	$	175
Research and development	605		362
Sales, general and administrative	(140)		2,442
	$	555	$	2,979

Equity-based compensation expense decreased for the three months ended March 31, 2023 when compared to the three months ended March 31, 2022, primarily due to the reversal of equity-based compensation expense from forfeitures. Employees separating from the Company forfeited an increased number of stock options and RSUs than in the previous period.

The table below summarizes share-based compensation cost capitalized to inventory for the three months ended March 31, 2023 and 2022 (in thousands):

	Three Months Ended March 31,
	2023		2022
Cost capitalized to inventory	$	74	$	43