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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | $ 11,373 | $ 3,024 | $ 20,692 | $ 5,423
Cost of revenue |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | 742 | 114 | 1,394 | 191
Sales and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | 4,215 | 675 | 7,581 | 1,277
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | 2,441 | 640 | 4,471 | 1,167
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Stock-based compensation | $ 3,975 | $ 1,595 | $ 7,246 | $ 2,788

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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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