Investments - Summary of Gross Unrealized Gains and Losses and Credit Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 423,153	$ 683,006
Gross Unrealized Gains	397	437
Gross Unrealized Losses	(153)	(1,251)
Fair Value	423,397	682,192
U.S. Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,444	167,165
Gross Unrealized Gains	18	107
Gross Unrealized Losses	(5)	(347)
Fair Value	36,457	166,925
U.S. Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	268,841	210,491
Gross Unrealized Gains	305	191
Gross Unrealized Losses	(133)	(484)
Fair Value	269,013	210,198
International Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,411	97,698
Gross Unrealized Gains	65	99
Gross Unrealized Losses	(15)	(122)
Fair Value	52,461	97,675
U.S. Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	30,373	23,360
Gross Unrealized Gains		11
Gross Unrealized Losses		(1)
Fair Value	30,373	23,370
International Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,144	46,935
Gross Unrealized Gains		3
Gross Unrealized Losses		(38)
Fair Value	24,144	46,900
U.S. Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	900	8,830
Fair Value	900	8,830
U.S. Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,040	128,527
Gross Unrealized Gains	9	26
Gross Unrealized Losses		(259)
Fair Value	$ 10,049	$ 128,294