Fair Value Measurements - Schedule of Fair Value and Amortized Cost of Investments in Marketable Securities by Major Security Type (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 1,278,349	$ 682,559
Unrealized Gain	13	4
Unrealized Loss	(7,257)	(1,265)
Fair Value	1,271,105	681,298
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	187,998	147,914
Fair Value	187,998	147,914
U.S. Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	322,351	112,473
Unrealized Gain	1	1
Unrealized Loss	(2,150)	(304)
Fair Value	320,202	112,170
Corporate Securities and Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	752,429	422,172
Unrealized Gain	8	3
Unrealized Loss	(5,086)	(961)
Fair Value	747,351	$ 421,214
Certificates of Deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	12,071
Unrealized Gain	4
Unrealized Loss	(2)
Fair Value	12,073
U.S. Government Agency Obligation
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	3,500
Unrealized Loss	(19)
Fair Value	$ 3,481