Investment Securities - Summary of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 693,927	$ 412,570
Unrealized Gains	563	490
Unrealized (Losses)	(372)	(386)
Estimated Fair Value	694,118	412,674
U.S. Government Agency Securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	257,908	150,651
Unrealized Gains	143	148
Unrealized (Losses)	(98)	(204)
Estimated Fair Value	257,953	150,595
FDIC Certificates of Deposit
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost		4,410
Unrealized Gains		2
Unrealized (Losses)		(12)
Estimated Fair Value		4,400
Certificates of Deposit
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	60,000	60,000
Unrealized Gains	0	0
Unrealized (Losses)	0	0
Estimated Fair Value	60,000	60,000
Commercial Paper
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	39,650	78,610
Unrealized Gains	19	59
Unrealized (Losses)	(3)	(27)
Estimated Fair Value	39,666	78,642
Corporate Notes/Bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	336,369	118,899
Unrealized Gains	401	281
Unrealized (Losses)	(271)	(143)
Estimated Fair Value	$ 336,499	$ 119,037