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Stock-based Compensation - Summary of Stock-based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Allocated share based compensation $ 112,295 $ 50,744
Infrastructure and trust & safety    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Allocated share based compensation 11,356 5,688
Research and development    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Allocated share based compensation 74,814 31,594
General and administrative    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Allocated share based compensation 20,795 11,247
Sales and marketing    
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]    
Allocated share based compensation $ 5,330 $ 2,215