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Investments - Summary of Available-for-Sale Investments by Security type (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Estimated Fair Value	$ 329,457	$ 94,523
Gross Unrealized Gains	84	18
Gross Unrealized Losses	0	0
Amortized cost	329,373	94,505
U.S. Treasuries - Cash equivalents [Member]
Net Investment Income [Line Items]
Estimated Fair Value	329,457	94,523
Gross Unrealized Gains	84	18
Gross Unrealized Losses	0	0
Amortized cost	$ 329,373	$ 94,505

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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