Stockholders' Equity and Stock Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total employee awards		$ 43,280	$ 273
Capitalized stock-based compensation	$ 585	0	0
Total stock-based compensation expense	174,028	43,280	273
Employee awards:
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total employee awards	173,443	44	273
Secondary transaction
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total employee awards	0	43,236	0
Cost of revenue | Employee awards:
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total employee awards	5,604	0	13
Research and development | Employee awards:
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total employee awards	45,162	8	151
Sales and marketing | Employee awards:
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total employee awards	53,169	7	104
General and administrative | Employee awards:
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total employee awards	$ 69,508	$ 29	$ 5