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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 436,189	$ 32,073
Unrealized Gains
Unrealized Losses
Estimated Fair Value	436,189	32,073
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	109,760	132,932
Unrealized Gains	9	48
Unrealized Losses	(8)	(17)
Estimated Fair Value	109,761	132,963
Marketable Securities Available-for-Sale | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	545,949	165,005
Unrealized Gains	9	48
Unrealized Losses	(8)	(17)
Estimated Fair Value	545,950	165,036
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	6,995	7,945
Unrealized Gains
Unrealized Losses
Estimated Fair Value	6,995	7,945
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	429,194	23,128
Unrealized Gains
Unrealized Losses
Estimated Fair Value	429,194	23,128
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		1,000
Unrealized Gains
Unrealized Losses
Estimated Fair Value		1,000
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	79,200	60,071
Unrealized Gains	9	3
Unrealized Losses		(11)
Estimated Fair Value	79,209	60,063
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	4,005	32,548
Unrealized Gains		31
Unrealized Losses	(1)
Estimated Fair Value	4,004	32,579
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	26,555	40,313
Unrealized Gains		14
Unrealized Losses	(7)	(6)
Estimated Fair Value	$ 26,548	$ 40,321

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