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Investments - Summary of Available-for-Sale Investments by Security type (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Net Investment Income [Line Items]
Estimated Fair Value	$ 473,831	$ 329,457
Gross Unrealized Gains	1	84
Gross Unrealized Losses	0	0
Amortized cost	473,830	329,373
U.S. Treasuries—Cash equivalents [Member]
Net Investment Income [Line Items]
Estimated Fair Value	473,831	329,457
Gross Unrealized Gains	1	84
Gross Unrealized Losses	0	0
Amortized cost	$ 473,830	$ 329,373

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