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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense Related to Stock Options, Performance Stock Units (PSUs), Restricted Stock Units (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, 2019 and 2018:

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
(In thousands)		2019				2018				2019				2018
Stock-based compensation expense included in cost of sales		$	83			$	101			$	272			$	298
Selling, general and administrative expense			1,142				894				2,867				2,924
Research and development expense			646				645				2,045				2,021
Stock-based compensation expense included in operating expenses			1,788				1,539				4,912				4,945
Total stock-based compensation expense			1,871				1,640				5,184				5,243
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock			(446	)			(292	)			(1,235	)			(1,016	)
Total stock-based compensation expense, net of tax		$	1,425			$	1,348			$	3,949			$	4,227

Summary of Stock Options Outstanding

The following table is a summary of our stock options outstanding as of December 31, 2018 and September 30, 2019, and the changes that occurred during the nine months ended September 30, 2019:

		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, 2018			4,382			$	22.91				4.10			$	—
Stock options exercised			(34	)		$	15.53
Stock options forfeited			(28	)		$	15.53
Stock options expired			(183	)		$	24.41
Stock options outstanding, September 30, 2019			4,137			$	22.96				3.27			$	—
Stock options exercisable, September 30, 2019			3,915			$	23.39				3.11			$	—

Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table is a summary of our PSUs, RSUs and restricted stock outstanding as of December 31, 2018 and September 30, 2019 and the changes that occurred during the nine months ended September 30, 2019.

		Number of Shares (in thousands)				Weighted Avg. Grant Date Fair Value (per share)
Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2018			1,570			$	18.52
PSUs, RSUs and restricted stock granted			63			$	12.81
PSUs, RSUs and restricted stock vested			(22	)		$	17.13
PSUs, RSUs and restricted stock forfeited			(175	)		$	18.69
Unvested PSUs, RSUs and restricted stock outstanding, September 30, 2019			1,436			$	18.27

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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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