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Stock-Based Compensation - Stock-based Compensation Expense and Related Income Tax Benefit (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Employee and director stock-based compensation expense | $ 2,204 | $ 2,623
Income tax benefit | 463 | 815
Cost of sales |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Employee and director stock-based compensation expense | 17 | 15
Research and development expenses |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Employee and director stock-based compensation expense | 155 | 119
Selling, general and administrative expenses | Employees |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Employee and director stock-based compensation expense | 1,528 | 1,744
Selling, general and administrative expenses | Outside directors |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Employee and director stock-based compensation expense | $ 504 | $ 745

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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