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Stock-Based Compensation - Allocation of Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | $ 25,704 | $ 17,592 | $ 8,786
Tax benefit related to stock-based compensation | 10,500 | 5,400 | 9,900
Cost of sales |  |  |
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | 703 | 597 | 233
Selling, general and administrative |  |  |
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | 19,816 | 13,006 | 6,475
Research and development |  |  |
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | 5,185 | 3,989 | 2,078
Non Employee |  |  |
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | $ 800 | $ 500 | $ 800

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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://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 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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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