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Stock-Based Compensation - Schedule of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | $ 874 | $ 853
Cost of product sales |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | 41 | 71
Cost of service sales |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | 0 | 0
Research and development |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | 172 | 170
Sales, marketing and support |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | 182 | 181
General and administrative |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | $ 479 | $ 431

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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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