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Stockholders' Equity - Stock-based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Stock-based Compensation Expense |  |  |  |
Stock-based compensation expense | $ 6,797 | $ 3,854 | $ 12,122 | $ 6,983
Cost of revenue |  |  |  |
Stock-based Compensation Expense |  |  |  |
Stock-based compensation expense | 853 | 575 | 1,531 | 1,009
Research and development |  |  |  |
Stock-based Compensation Expense |  |  |  |
Stock-based compensation expense | 1,064 | 801 | 1,941 | 1,438
Sales and marketing |  |  |  |
Stock-based Compensation Expense |  |  |  |
Stock-based compensation expense | 1,585 | 1,224 | 2,947 | 2,152
General and administrative |  |  |  |
Stock-based Compensation Expense |  |  |  |
Stock-based compensation expense | 3,295 | $ 1,254 | 5,703 | $ 2,384
Stock options |  |  |  |
Stock-based Compensation Expense |  |  |  |
Unrecognized stock-based compensation expense | 11,366 |  | $ 11,366 |
Weighted-average amortization period |  |  | 2 years 7 months 1 day |
Restricted stock units |  |  |  |
Stock-based Compensation Expense |  |  |  |
Unrecognized stock-based compensation expense | 56,023 |  | $ 56,023 |
Weighted-average amortization period |  |  | 3 years 12 days |
ESPP |  |  |  |
Stock-based Compensation Expense |  |  |  |
Unrecognized stock-based compensation expense | $ 708 |  | $ 708 |
Weighted-average amortization period |  |  | 5 months |

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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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- 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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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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