Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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 nine months ended September 30, 2020 and 2019:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In thousands)	2020			2019			2020			2019
Stock-based compensation expense included in cost of sales	$	101		$	83		$	303		$	272
Selling, general and administrative expense		953			1,142			2,999			2,867
Research and development expense		556			646			1,754			2,045
Stock-based compensation expense included in operating expenses		1,509			1,788			4,753			4,912
Total stock-based compensation expense		1,610			1,871			5,056			5,184
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock		(384	)		(446	)		(1,205	)		(1,235	)
Total stock-based compensation expense, net of tax	$	1,226		$	1,425		$	3,851		$	3,949

Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table summarizes PSUs, RSUs and restricted stock outstanding as of December 31, 2019 and September 30, 2020 and the changes that occurred during the nine months ended September 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		(15	)	$	12.76
PSUs, RSUs and restricted stock forfeited		(586	)	$	18.24
Unvested PSUs, RSUs and restricted stock outstanding, September 30, 2020		1,689		$	11.83

Summary of Stock Options Outstanding

The following table summarizes stock options outstanding as of December 31, 2019 and September 30, 2020 and the changes that occurred during the nine months ended September 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		(352	)	$	21.48
Stock options outstanding, September 30, 2020		3,220		$	22.94		2.7	$	—
Stock options exercisable, September 30, 2020		3,217		$	22.95		2.7	$	—