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Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | $ 12,897 | $ 1,057
Cost of revenue |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 267 | 32
Sales and marketing |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 3,163 | 279
Research and development |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | 6,090 | 417
General and administrative |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total stock-based compensation expense | $ 3,377 | $ 329

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