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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [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)		2021				2020				2021				2020
Stock-based compensation expense included in cost of revenue		$	125			$	87			$	256			$	202
Selling, general and administrative expense			1,098				971				2,196				2,046
Research and development expense			585				597				1,163				1,198
Stock-based compensation expense included in operating expenses			1,683				1,568				3,359				3,244
Total stock-based compensation expense			1,808				1,655				3,615				3,446
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock			(452	)			(394	)			(883	)			(821	)
Total stock-based compensation expense, net of tax		$	1,356			$	1,261			$	2,732			$	2,625

Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table summarizes PSUs, RSUs and restricted stock outstanding as of December 31, 2020 and June 30, 2021 and the changes that occurred during the six months ended June 30, 2021:

		Number of Shares (in thousands)				Weighted Avg. Grant Date Fair Value (per share)
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2020			1,846			$	11.49
PSUs, RSUs and restricted stock granted			357			$	16.73
PSUs, RSUs and restricted stock vested			(12	)		$	11.76
PSUs, RSUs and restricted stock forfeited			(47	)		$	11.58
Unvested PSUs, RSUs and restricted stock outstanding, June 30, 2021			2,144			$	12.41

Summary of Stock Options Outstanding

The following table summarizes stock options outstanding as of December 31, 2020 and June 30, 2021 and the changes that occurred during the six months ended June 30, 2021:

		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, 2020			2,718			$	21.17				2.9			$	—
Stock options exercised			(215	)		$	16.53								588
Stock options expired			(117	)		$	23.37								17
Stock options outstanding, June 30, 2021			2,386			$	21.47				2.4			$	4,721
Stock options exercisable, June 30, 2021			2,386			$	21.47				2.4			$	4,721

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Schedule of share based compensation performance stock units restricted stock units and restricted stock activity.

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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