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Stockholders' Equity (Deficit) - Summary of stock-based compensation expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation, net of amounts capitalized | $ 155,624 | $ 143,341 | $ 18,617
Capitalized stock-based compensation | 2,625 | 547 | 69
Total stock-based compensation | 158,249 | 143,888 | 18,686
Cost Of Revenue [Member] | Subscription [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation, net of amounts capitalized | 12,571 | 2,572 | 1,161
Cost Of Revenue [Member] | Services [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation, net of amounts capitalized | 5,418 | 1,745 | 994
Research and Development [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation, net of amounts capitalized | 49,051 | 33,755 | 6,268
Sales and Marketing [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation, net of amounts capitalized | 55,506 | 14,734 | 6,545
General and Administrative [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation, net of amounts capitalized | $ 33,078 | $ 90,535 | $ 3,649

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