Fair Value Measurements - Schedule of Fair Value and Amortized Cost of Investments in Marketable Securities by Major Security Type (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 1,201,721	$ 682,559
Unrealized Gain	26	4
Unrealized Loss	(9,827)	(1,265)
Fair Value	1,191,920	681,298
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	136,260	147,914
Fair Value	136,260	147,914
U.S. Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	354,866	112,473
Unrealized Gain	9	1
Unrealized Loss	(3,527)	(304)
Fair Value	351,348	112,170
Corporate Securities and Commercial Paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	686,741	422,172
Unrealized Gain	15	3
Unrealized Loss	(6,128)	(961)
Fair Value	680,628	$ 421,214
Certificates of Deposit
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	4,337
Unrealized Gain	2
Unrealized Loss	0
Fair Value	4,339
U.S. Government Agency Obligation
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	19,517
Unrealized Loss	(172)
Fair Value	$ 19,345