EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2023

EMPLOYEE BENEFIT PLANS

Schedule of Share-based Payment Awards, Stock Options, Valuation Assumptions

The Company estimated the fair value of purchase rights granted under the 2021 Purchase Plan during the period using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions, resulting in the following weighted average fair values:

	Three Months Ended March 31,
	2023			2022
Expected life (in years)		1.25			1.25
Volatility		46.70	%		48.90	%
Risk-free interest rate		4.48	%		0.86	%
Expected dividend		—			—
Weighted average fair value of purchase rights granted during the period	$	11.90		$	10.76

Schedule of Share-based Payment Arrangement, Expensed and Capitalized Amounts

	Three Months Ended March 31,
	2023		2022
Costs of revenues	$	964	$	728
Research and development		1,794		3,168
Selling, general, and administrative		2,126		1,657
Stock-based compensation expenses	$	4,884	$	5,553

Schedule of Share-based Payment Arrangement, Options Activity - Additional Information

Additional information with respect to options under the Stock Plans during the three months ended March 31, 2023, is as follows:

	Outstanding Options
				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number of	Exercise		Contractual	Intrinsic
	Options	Price		Term	Value
	(in thousands)	per Share		(Years)	(in thousands)
Outstanding, December 31, 2022	68	$	16.11
Granted	—		—
Exercised	(21)		16.42
Canceled	—		—
Expired	—		—
Outstanding, March 31, 2023	47	$	15.98	4.58	$	1,248
Vested and expected to vest, March 31, 2023	47	$	15.97	4.56	$	1,242
Exercisable, March 31, 2023	39	$	15.81	4.11	$	1,038

Schedule of Share-based Payment Arrangement, Restricted Stock Unit Activity

Nonvested restricted stock unit activity during the three months ended March 31, 2023, was as follows:

		Weighted
		Average Grant
	Shares	Date Fair Value
	(in thousands)	Per Share
Nonvested, December 31, 2022	2,124	$	21.29
Granted	46	$	33.46
Vested	(419)	$	20.62
Forfeited	(3)	$	19.69
Nonvested, March 31, 2023	1,748	$	21.78