Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock

The following table summarizes stock-based compensation expense related to stock options, performance stock units (“PSUs”), restricted stock units (“RSUs”) and restricted stock:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(In thousands)	2022			2021			2022			2021
Stock-based compensation expense included in cost of revenue	$	162		$	125		$	321		$	256
Selling, general and administrative expense		1,135			1,098			2,259			2,196
Research and development expense		591			585			1,201			1,163
Stock-based compensation expense included in operating expenses		1,726			1,683			3,460			3,359
Total stock-based compensation expense		1,888			1,808			3,781			3,615
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock		(472	)		(452	)		(945	)		(883	)
Total stock-based compensation expense, net of tax	$	1,416		$	1,356		$	2,836		$	2,732

Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table summarizes PSUs, RSUs and restricted stock outstanding as of December 31, 2021 and June 30, 2022 and the changes that occurred during the six months ended June 30, 2022:

	Number of Shares (in thousands)			Weighted Avg. Grant Date Fair Value (per share)
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2021		1,930		$	14.11
PSUs, RSUs and restricted stock granted		336		$	20.14
PSUs, RSUs and restricted stock vested		(15	)	$	13.26
PSUs, RSUs and restricted stock forfeited		(41	)	$	14.08
Unvested PSUs, RSUs and restricted stock outstanding, June 30, 2022		2,210		$	15.04

Summary of Stock Options Outstanding

The following table summarizes stock options outstanding as of December 31, 2021 and June 30, 2022 and the changes that occurred during the six months ended June 30, 2022:

	Number of Stock Options (in thousands)			Weighted Avg. Exercise Price (per share)		Weighted Avg. Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Stock options outstanding, December 31, 2021		1,721		$	19.37		2.4	$	6,669
Stock options exercised		(37	)	$	17.24			$	110
Stock options expired		(23	)	$	23.67			$	5
Stock options outstanding, June 30, 2022		1,661		$	19.36		1.9	$	1,127
Stock options exercisable, June 30, 2022		1,661		$	19.36		1.9	$	1,127