Stock-based Compensation - Summary of Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	$ 161,359	$ 89,319	$ 420,042	$ 221,722
Infrastructure and trust & safety
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	14,948	8,597	39,959	22,082
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	111,450	56,423	279,978	139,643
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	28,327	20,963	82,096	51,139
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Allocated share based compensation	$ 6,634	$ 3,336	$ 18,009	$ 8,858