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Stockholders' Equity - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | $ 15,343 | $ 9,643 | $ 7,730
Employee Stock Options |  |  |
Stock-based Compensation Expense |  |  |
Unrecognized stock-based compensation expense | $ 10,703 |  |
Weighted-average amortization period | 2 years 6 months |  |
Restricted Stock Units |  |  |
Stock-based Compensation Expense |  |  |
Unrecognized stock-based compensation expense | $ 26,401 |  |
Weighted-average amortization period | 2 years 9 months 18 days |  |
ESPP |  |  |
Stock-based Compensation Expense |  |  |
Unrecognized stock-based compensation expense | $ 670 |  |
Weighted-average amortization period | 4 months 24 days |  |
Cost of revenue |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | $ 2,202 | 1,375 | 866
Research and development |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | 3,042 | 2,059 | 1,790
Sales and marketing |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | 4,364 | 2,363 | 1,800
General and administrative |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | 5,735 | $ 3,846 | $ 3,274
Board of Directors Executive Chairman | General and administrative |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | $ 1,000 |  |

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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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