Investments in Marketable Securities - Summary of Investments Classified As Available-For-Sale Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 878,116	$ 306,661
Gross Unrealized Gains	2,195	156
Gross Unrealized Losses	(218)	(254)
Aggregate Estimated Fair Value	880,093	306,563
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,550	24,226
Aggregate Estimated Fair Value	14,550	24,226
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	690,756	168,564
Gross Unrealized Gains	1,954	148
Gross Unrealized Losses	(138)	(128)
Aggregate Estimated Fair Value	692,572	168,584
Government debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	172,810	113,871
Gross Unrealized Gains	241	8
Gross Unrealized Losses	(80)	(126)
Aggregate Estimated Fair Value	$ 172,971	$ 113,753