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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

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 for the three and six months ended June 30, 2020 and 2019:

		Three Months Ended								Six Months Ended
		June 30,								June 30,
(In thousands)		2020				2019				2020				2019
Stock-based compensation expense included in cost of sales		$	87			$	85			$	202			$	189
Selling, general and administrative expense			971				662				2,046				1,725
Research and development expense			597				707				1,198				1,399
Stock-based compensation expense included in operating expenses			1,568				1,369				3,244				3,124
Total stock-based compensation expense			1,655				1,454				3,446				3,313
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock			(394	)			(332	)			(821	)			(775	)
Total stock-based compensation expense, net of tax		$	1,261			$	1,122			$	2,625			$	2,538

Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table summarizes PSUs, RSUs and restricted stock outstanding as of December 31, 2019 and June 30, 2020 and the changes that occurred during the six months ended June 30, 2020.

		Number of Shares (in thousands)				Weighted Avg. Grant Date Fair Value (per share)
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2019			1,891			$	14.58
PSUs, RSUs and restricted stock granted			399			$	8.21
PSUs, RSUs and restricted stock vested			(13	)		$	12.32
PSUs, RSUs and restricted stock forfeited			(518	)		$	19.27
Unvested PSUs, RSUs and restricted stock outstanding, June 30, 2020			1,759			$	11.78

Summary of Stock Options Outstanding

The following table summarizes stock options outstanding as of December 31, 2019 and June 30, 2020 and the changes that occurred during the six months ended June 30, 2020:

		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, 2019			3,572			$	22.88				3.4			$	—
Stock options exercised			—			$	—
Stock options forfeited			—			$	—
Stock options expired			(265	)		$	21.20
Stock options outstanding, June 30, 2020			3,307			$	22.93				2.9			$	—
Stock options exercisable, June 30, 2020			3,305			$	22.93				2.9			$	—

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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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