Common Stock and Stockholders' Equity - Compensation Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Compensation costs charged as an expense
Stock-based compensation	$ 51,000	$ 82,970	$ 111,436	$ 169,270
Cost of revenue (exclusive of depreciation and amortization, which is shown separately)
Compensation costs charged as an expense
Stock-based compensation	2,123	1,786	4,319	4,148
Advertising and marketing
Compensation costs charged as an expense
Stock-based compensation	3,198	4,815	6,909	9,897
Sales
Compensation costs charged as an expense
Stock-based compensation	10,709	18,953	22,781	40,120
Technology and development
Compensation costs charged as an expense
Stock-based compensation	15,785	27,699	33,872	54,425
General and administrative expenses
Compensation costs charged as an expense
Stock-based compensation	$ 19,185	$ 29,717	$ 43,555	$ 60,680