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Stock-Based Compensation (Tables) | 6 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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