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Stockholders' Equity - Summary of Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | $ 237,073 | $ 172,049
Cost of Revenue |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | 2,656 | 1,782
Research and Development |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | 163,793 | 118,317
Sales and Marketing |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | 29,084 | 24,806
General and Administrative |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | $ 41,540 | $ 27,144

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