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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 111,978	$ 301,977
Debt and equity securities, Amortized Cost	112,212	302,968
Debt and equity securities, Unrealized Gains	27	46
Debt and equity securities, Unrealized Losses	(261)	(1,037)
Debt and equity securities, Estimated Fair Value	111,978	301,977
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		15,956
Debt securities, Unrealized Gains		0
Debt securities, Unrealized Losses		(11)
Debt securities, Estimated Fair Value		15,945
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	104,852	81,216
Debt securities, Unrealized Gains	27	16
Debt securities, Unrealized Losses	(231)	(291)
Debt securities, Estimated Fair Value	104,648	80,941
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	7,360
Debt securities, Unrealized Gains	0
Debt securities, Unrealized Losses	(30)
Debt securities, Estimated Fair Value	$ 7,330
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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