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Stockholders' Equity - 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]        
Stock-based compensation expense $ 36,636 $ 12,142 $ 100,900 $ 34,752
Share-based payment arrangement, amount capitalized 2,600 600 3,411 1,238
Cost of revenue        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 1,897 929 4,911 2,634
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 14,752 4,371 31,344 10,095
Sales and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 9,121 3,194 19,760 11,753
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 10,866 $ 3,648 $ 44,885 $ 10,270