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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 198,576	$ 436,189
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	198,576	436,189
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	390,206	109,760
Unrealized Gains	0	9
Unrealized Losses	(2,296)	(8)
Estimated Fair Value	387,910	109,761
Marketable Securities Available-for-Sale | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	588,782	545,949
Unrealized Gains	0	9
Unrealized Losses	(2,296)	(8)
Estimated Fair Value	586,486	545,950
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	38,612	6,995
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	38,612	6,995
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	159,964	429,194
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	159,964	429,194
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	41,281	4,005
Unrealized Gains		0
Unrealized Losses	(338)	(1)
Estimated Fair Value	40,943	4,004
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	34,246	26,555
Unrealized Gains		0
Unrealized Losses	(219)	(7)
Estimated Fair Value	34,027	26,548
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	314,679	79,200
Unrealized Gains		9
Unrealized Losses	(1,739)	0
Estimated Fair Value	$ 312,940	$ 79,209

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