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Stockholders' Equity - Summary of Total Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
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