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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, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 301,977	$ 373,271
Debt and equity securities, Amortized Cost	302,968	373,475
Debt and equity securities, Unrealized Gains	46	9
Debt and equity securities, Unrealized Losses	(1,037)	(213)
Debt and equity securities, Estimated Fair Value	301,977	373,271
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	15,956	140,287
Debt securities, Unrealized Gains	0	0
Debt securities, Unrealized Losses	(11)	(100)
Debt securities, Estimated Fair Value	15,945	140,187
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	81,216	49,512
Debt securities, Unrealized Gains	16	0
Debt securities, Unrealized Losses	(291)	(38)
Debt securities, Estimated Fair Value	80,941	49,474
Municipal Bonds
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
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		26,006
Debt securities, Unrealized Gains		0
Debt securities, Unrealized Losses		(22)
Debt securities, Estimated Fair Value		25,984
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	184,923	157,670
Debt securities, Unrealized Gains	30	9
Debt securities, Unrealized Losses	(637)	(53)
Debt securities, Estimated Fair Value	$ 184,316	$ 157,626

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