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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, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 323,808	$ 250,208
Debt and equity securities, Amortized Cost	324,152	250,182
Debt and equity securities, Unrealized Gains	1	166
Debt and equity securities, Unrealized Losses	(345)	(140)
Debt and equity securities, Estimated Fair Value	323,808	250,208
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	157,687	75,315
Debt securities, Unrealized Gains	0	47
Debt securities, Unrealized Losses	(179)	(28)
Debt securities, Estimated Fair Value	157,508	75,334
Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	166,465	174,867
Debt securities, Unrealized Gains	1	119
Debt securities, Unrealized Losses	(166)	(112)
Debt securities, Estimated Fair Value	$ 166,300	$ 174,874

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