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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 247,727	$ 301,977
Debt and equity securities, Amortized Cost	248,056	302,968
Debt and equity securities, Unrealized Gains	28	46
Debt and equity securities, Unrealized Losses	357	(1,037)
Debt and equity securities, Estimated Fair Value	247,727	301,977
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	42,180	15,956
Debt securities, Unrealized Gains	0	0
Debt securities, Unrealized Losses	(90)	(11)
Debt securities, Estimated Fair Value	42,090	15,945
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	205,876	81,216
Debt securities, Unrealized Gains	28	16
Debt securities, Unrealized Losses	(267)	(291)
Debt securities, Estimated Fair Value	$ 205,637	80,941
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		20,873
Debt securities, Unrealized Gains		0
Debt securities, Unrealized Losses		(98)
Debt securities, Estimated Fair Value		20,775
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		184,923
Debt securities, Unrealized Gains		30
Debt securities, Unrealized Losses		(637)
Debt securities, Estimated Fair Value		$ 184,316

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