Investments - Summary of Available-for-Sale Investments by Security type (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Net Investment Income [Line Items]
Estimated Fair Value	$ 164,320	$ 329,457
Gross Unrealized Gains	0	84
Gross Unrealized Losses	22	0
Amortized cost	164,342	329,373
U.S. Treasuries—Cash equivalents [Member]
Net Investment Income [Line Items]
Estimated Fair Value	164,320	329,457
Gross Unrealized Gains	0	84
Gross Unrealized Losses	22	0
Amortized cost	$ 164,342	$ 329,373