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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2019 and 2018:

		Three Months Ended								Six Months Ended
		June 30,								June 30,
(In thousands)		2019				2018				2019				2018
Stock-based compensation expense included in cost of sales		$	85			$	102			$	189			$	197
Selling, general and administrative expense			662				995				1,725				2,030
Research and development expense			707				687				1,399				1,376
Stock-based compensation expense included in operating expenses			1,369				1,682				3,124				3,406
Total stock-based compensation expense			1,454				1,784				3,313				3,603
Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock			(332	)			(340	)			(775	)			(724	)
Total stock-based compensation expense, net of tax		$	1,122			$	1,444			$	2,538			$	2,879

Summary of Stock Options Outstanding

The following table is a summary of our stock options outstanding as of December 31, 2018 and June 30, 2019, and the changes that occurred during the six months ended June 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			(10	)		$	15.67
Stock options expired			(156	)		$	24.50
Stock options outstanding, June 30, 2019			4,182			$	22.93				3.64			$	—
Stock options exercisable, June 30, 2019			3,942			$	23.39				3.47			$	—

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 June 30, 2019 and the changes that occurred during the six months ended June 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			59			$	12.54
PSUs, RSUs and restricted stock vested			(1	)		$	18.86
PSUs, RSUs and restricted stock forfeited			(63	)		$	16.66
Unvested PSUs, RSUs and restricted stock outstanding, June 30, 2019			1,565			$	18.37

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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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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