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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 267,437	$ 301,977
Debt and equity securities, Amortized Cost	267,989	302,968
Debt and equity securities, Unrealized Gains	5	46
Debt and equity securities, Unrealized Losses	557	(1,037)
Debt and equity securities, Estimated Fair Value	267,437	301,977
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	38,752	15,956
Debt securities, Unrealized Gains	3	0
Debt securities, Unrealized Losses	(82)	(11)
Debt securities, Estimated Fair Value	38,673	15,945
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	221,852	81,216
Debt securities, Unrealized Gains	2	16
Debt securities, Unrealized Losses	(473)	(291)
Debt securities, Estimated Fair Value	221,381	80,941
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	7,385
Debt securities, Unrealized Gains	0
Debt securities, Unrealized Losses	(2)
Debt securities, Estimated Fair Value	$ 7,383
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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