Marketable Securities - Summary of Available -for-sale Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Marketable Securities [Line Items]
Amortized Cost	$ 810,178	$ 785,473
Gross Unrealized Gains	132	522
Gross Unrealized Losses	(1,286)	(656)
Estimated Fair Value	809,024	785,339
U.S. Treasury and Other Government - Backed Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	439,731	382,260
Gross Unrealized Gains	69	302
Gross Unrealized Losses	(727)	(254)
Estimated Fair Value	439,073	382,308
Financial Institution Debt Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	228,035	246,270
Gross Unrealized Gains	58	92
Gross Unrealized Losses	(381)	(243)
Estimated Fair Value	227,712	246,119
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	105,597	97,490
Gross Unrealized Gains	5	53
Gross Unrealized Losses	(125)	(135)
Estimated Fair Value	105,477	97,408
Other Asset Backed Securities [Member]
Marketable Securities [Line Items]
Amortized Cost	36,815	59,453
Gross Unrealized Gains	0	75
Gross Unrealized Losses	(53)	(24)
Estimated Fair Value	$ 36,762	$ 59,504