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Investments - Summary of Gross Unrealized Losses and Fair Value of Available-For-Sale Investment Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value	$ 133,492	$ 84,390
Less Than 12 Months, Unrealized Losses	(110)	(108)
Total, Estimated Fair Value	133,492	84,390
Total, Unrealized Losses	(110)	(108)
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value	46,874
Less Than 12 Months, Unrealized Losses	(25)
Total, Estimated Fair Value	46,874
Total, Unrealized Losses	(25)
Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Estimated Fair Value	86,618	84,390
Less Than 12 Months, Unrealized Losses	(85)	(108)
Total, Estimated Fair Value	86,618	84,390
Total, Unrealized Losses	$ (85)	$ (108)

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