STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2022

Share-Based Payment Arrangement [Abstract]

Summary of Stock-Based Compensation Expense

Total stock-based compensation expense recognized in the Company’s condensed consolidated statements of operations and comprehensive loss is classified as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Cost of revenue	$	180	$	397	$	356	$	632
Research and development	649		675		1,373		1,311
Selling and marketing	555		454		1,248		748
General and administrative	3,716		4,929		7,155		12,258
Total stock-based compensation expense	$	5,100	$	6,455	$	10,132	$	14,949

Summary of Incentive Stock Units

The table below summarizes the Company’s activity and related information for its ISUs:

	RSUs and DSUs			PSUs
	Number of Shares	Weighted Average Grant Date Fair Value		Number of Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2021	5,536,925	$	4.04	707,088		$	4.66
ISUs granted	2,443,132	$	3.88	1,600,549	(1)	$	4.25
ISUs vested	(2,176,063)	$	3.80	—		$	—
ISUs forfeited	(159,504)	$	4.19	(4,756)		$	4.66
Unvested at June 30, 2022	5,644,490	$	4.04	2,302,881		$	4.38
Vested and unreleased	218,300			—
Outstanding at June 30, 2022	5,862,790			2,302,881

Summary of Company's Stock Option Activity and Related Information

A summary of the Company’s stock option activity and related information is as follows:

	Number of Stock Options Outstanding	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
					(In thousands)
Options outstanding at December 31, 2021	7,156,776	$	6.97	6.1	$	5,203
Options granted	—	—
Options exercised	(24,208)	$	2.76
Options cancelled or forfeited	(220,154)	$	7.84
Options outstanding at June 30, 2022	6,912,414	$	6.96	5.7	$	1,228
Options exercisable at June 30, 2022	6,289,250	$	7.13	5.5	$	1,008
Options vested and expected to vest at June 30, 2022	6,866,646	$	6.99	5.7	$	1,201