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Stockholders' Equity - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | $ 9,643 | $ 7,730 | $ 6,753
Employee Stock Options |  |  |
Stock-based Compensation Expense |  |  |
Unrecognized stock-based compensation expense | $ 5,722 |  |
Weighted-average amortization period | 2 years 4 months 8 days |  |
Restricted Stock Units |  |  |
Stock-based Compensation Expense |  |  |
Unrecognized stock-based compensation expense | $ 12,619 |  |
Weighted-average amortization period | 2 years 10 months 15 days |  |
ESPP |  |  |
Stock-based Compensation Expense |  |  |
Unrecognized stock-based compensation expense | $ 409 |  |
Weighted-average amortization period | 4 months 14 days |  |
Cost of Revenue |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | $ 1,375 | 866 | 542
Research and Development |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | 2,059 | 1,790 | 1,931
Sales and Marketing |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | 2,363 | 1,800 | 1,510
General and Administrative |  |  |
Stock-based Compensation Expense |  |  |
Stock-based compensation expense | $ 3,846 | $ 3,274 | $ 2,770

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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