STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based Compensation Expense

The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three months ended March 31, 2022 and 2021:

	Three Months Ended
	March 31,
(In thousands)	2022		2021
Cost of revenues	$	320	$	631
Research and development		3,055		2,391
Sales and marketing		1,948		1,614
General and administrative		3,690		3,844
Total stock-based compensation expense	$	9,013	$	8,480

Summary of Option Activity Under the Plans

A summary of stock options outstanding as of March 31, 2022, and activity during the three months ended, is presented below:

				Weighted-
		Weighted-		Average
		Average		Remaining	Aggregate
	Shares	Exercise		Contractual Term	Intrinsic Value
	(In thousands)	Price		(In years)	(In thousands)
Outstanding at January 1, 2022	12	$	21.44
Granted	—		—
Exercised	(12)	$	21.44
Forfeited or expired	—		—
Outstanding at March 31, 2022	—	$	—	—	$	—
Vested and exercisable at March 31, 2022	—			—	$	—

Performance Based Awards (PSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of PSUs outstanding as of March 31, 2022, and activity during the three months ended, is presented below:

				Weighted-
		Weighted-		Average
		Average		Remaining	Aggregate
	Shares	Grant Date Fair		Contractual Term	Intrinsic Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2022	104	$	84.47
Granted	117	$	79.84
Vested	(104)	$	84.47
Forfeited	—		—
Outstanding at March 31, 2022	117	$	79.84	0.75	$	10,819
Outstanding and expected to vest at March 31, 2022	117			0.75	$	10,819

Long-Term Performance-Based Awards (PRSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of PRSUs outstanding as of March 31, 2022, and activity during the three months ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2022	383	$	53.14
Granted	110	$	78.96
Vested	(135)	$	34.09
Forfeited	—		—
Outstanding at March 31, 2022	358	$	68.18	1.65	$	33,214
Outstanding and expected to vest at March 31, 2022	332			1.56	$	30,771

Restricted Stock Units (RSUs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of RSUs outstanding as of March 31, 2022, and activity during the three months ended, is presented below:

				Weighted-Average	Aggregate
		Weighted-Average		Remaining	Intrinsic
	Shares	Grant Date Fair		Contractual Term	Value
	(In thousands)	Value Per Share		(In years)	(In thousands)
Outstanding at January 1, 2022	1,144	$	46.81
Granted	257	$	77.73
Vested	(158)	$	42.27
Forfeited	(9)	$	52.58
Outstanding at March 31, 2022	1,234	$	53.78	1.78	$	114,351
Outstanding and expected to vest at March 31, 2022	1,157			1.36	$	107,194