STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Cost of revenue	$	122	$	238	$	478	$	870
Research and development	706		694		2,079		2,005
Selling and marketing	838		414		2,086		1,162
General and administrative	3,870		3,288		11,025		15,546
Total stock-based compensation expense	$	5,536	$	4,634	$	15,668	$	19,583

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	2,488,810	$	3.86	1,951,715	$	4.33
ISUs vested	(2,267,173)	$	3.81	—	$	—
ISUs forfeited	(176,820)	$	4.23	(4,756)	$	4.66
Unvested at September 30, 2022	5,581,742	$	4.03	2,654,047	$	4.42
Vested and unreleased	236,706			—
Outstanding at September 30, 2022	5,818,448			2,654,047

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	(27,460)	$	2.75
Options cancelled or forfeited	(331,784)	$	7.79
Options outstanding at September 30, 2022	6,797,532	$	6.95	5.5	$	2,277
Options exercisable at September 30, 2022	6,362,900	$	7.12	5.4	$	1,837
Options vested and expected to vest at September 30, 2022	6,765,944	$	6.97	5.5	$	2,230