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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 250,208	$ 301,977
Debt and equity securities, Amortized Cost	250,182	302,968
Debt and equity securities, Unrealized Gains	166	46
Debt and equity securities, Unrealized Losses	(140)	(1,037)
Debt and equity securities, Estimated Fair Value	250,208	301,977
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	75,315	15,956
Debt securities, Unrealized Gains	47	0
Debt securities, Unrealized Losses	(28)	(11)
Debt securities, Estimated Fair Value	75,334	15,945
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	174,867	81,216
Debt securities, Unrealized Gains	119	16
Debt securities, Unrealized Losses	(112)	(291)
Debt securities, Estimated Fair Value	$ 174,874	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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