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Stock-Based Compensation - Allocation of Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Allocation of stock-based compensation |  |  |  |
Stock-based compensation expense | $ 4,734 | $ 2,048 | $ 7,935 | $ 3,465
Cost of sales |  |  |  |
Allocation of stock-based compensation |  |  |  |
Stock-based compensation expense | 141 | 44 | 270 | 82
Selling, general and administrative |  |  |  |
Allocation of stock-based compensation |  |  |  |
Stock-based compensation expense | 3,470 | 1,391 | 5,784 | 2,503
Research and development |  |  |  |
Allocation of stock-based compensation |  |  |  |
Stock-based compensation expense | $ 1,123 | $ 613 | $ 1,881 | $ 880

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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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