Fair Value Measurements - Schedule of Fair Value and Amortized Cost of Investments in Marketable Securities by Major Security Type (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 1,347,030	$ 682,559
Unrealized Gain	41	4
Unrealized Loss	(4,701)	(1,265)
Fair Value	1,342,370	681,298
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	475,934	147,914
Fair Value	475,934	147,914
U.S. Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	323,034	112,473
Unrealized Gain	7	1
Unrealized Loss	(1,399)	(304)
Fair Value	321,642	112,170
Corporate Securities and Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	527,328	422,172
Unrealized Gain	24	3
Unrealized Loss	(3,301)	(961)
Fair Value	524,051	$ 421,214
Certificates of Deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	20,734
Unrealized Gain	10
Unrealized Loss	(1)
Fair Value	$ 20,743