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Share-Based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Total share-based compensation expense | $ 2,899 | $ 2,260 | $ 5,468 | $ 3,767
Employee stock options |  |  |  |
Total share-based compensation expense | 12 | 268 | 12 | 547
Restricted stock units |  |  |  |
Total share-based compensation expense | 2,887 | 1,992 | 5,456 | 3,220
Cost of goods sold |  |  |  |
Total share-based compensation expense | 211 | 134 | 388 | 212
Research and development. |  |  |  |
Total share-based compensation expense | 676 | 441 | 1,252 | 706
Sales and marketing. |  |  |  |
Total share-based compensation expense | 260 | 169 | 488 | 249
General and administrative. |  |  |  |
Total share-based compensation expense | $ 1,752 | $ 1,516 | $ 3,340 | $ 2,600

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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