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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, 2023	Dec. 31, 2022
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 154,511	$ 202,004
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	154,511	202,004
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	567,417	423,796
Unrealized Gains	6	12
Unrealized Losses	(1,518)	(1,417)
Estimated Fair Value	565,905	422,391
Marketable Securities Available-for-Sale | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	721,928	625,800
Unrealized Gains	6	12
Unrealized Losses	(1,518)	(1,417)
Estimated Fair Value	720,416	624,395
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	21,922	29,586
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	21,922	29,586
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	131,837	172,418
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	131,837	172,418
U.S. Treasuries | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	51,734	42,502
Unrealized Gains	0	0
Unrealized Losses	(145)	(194)
Estimated Fair Value	51,589	42,308
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	190,323	88,429
Unrealized Gains	0	0
Unrealized Losses	(1,011)	(397)
Estimated Fair Value	189,312	88,032
Corporate Debt Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	752
Unrealized Gains	0
Unrealized Losses	0
Estimated Fair Value	752
Corporate Debt Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	325,360	292,865
Unrealized Gains	6	12
Unrealized Losses	(362)	(826)
Estimated Fair Value	$ 325,004	$ 292,051

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Topic 944
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-Topic 320
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