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Stockholders' Equity - Summary of Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total | $ 300,898 | $ 192,080 | $ 794,571 | $ 550,300
Cost of Revenue |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total | 9,132 | 2,623 | 14,635 | 6,471
Research and Development |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total | 198,893 | 132,003 | 537,177 | 377,836
Sales and Marketing |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total | 51,675 | 27,393 | 118,250 | 79,306
General and Administrative |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total | $ 41,198 | $ 30,061 | $ 124,509 | $ 86,687

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