Stock-based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 341,942	$ 79,158	$ 17,634
Infrastructure and trust & safety
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	35,255	7,396	2,085
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	219,851	39,402	9,695
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	72,929	25,939	3,347
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 13,907	$ 6,421	$ 2,507