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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Summary of Cash, Cash Equivalents and Marketable Securities (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 112,501	$ 150,278
Unrealized Gains	0	1
Unrealized Losses	0	0
Estimated Fair Value	112,501	150,279
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	624,012	591,177
Unrealized Gains	162	1,179
Unrealized Losses	(1,063)	(333)
Estimated Fair Value	623,111	592,023
Marketable Securities Available-for-Sale | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	736,513	741,455
Unrealized Gains	162	1,180
Unrealized Losses	(1,063)	(333)
Estimated Fair Value	735,612	742,302
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	8,267	11,190
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	8,267	11,190
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	96,611	131,635
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	96,611	131,635
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	134,941	74,109
Unrealized Gains	76	172
Unrealized Losses	(321)	(44)
Estimated Fair Value	134,696	74,237
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	172,341	216,265
Unrealized Gains	48	692
Unrealized Losses	(305)	(269)
Estimated Fair Value	172,084	216,688
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	7,623	7,453
Unrealized Gains	0	1
Unrealized Losses	0	0
Estimated Fair Value	7,623	7,454
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	316,730	300,803
Unrealized Gains	38	315
Unrealized Losses	(437)	(20)
Estimated Fair Value	$ 316,331	$ 301,098

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