Fair Value Measurements - Summary of Fair Value of Financial Assets Consists of Cash Equivalents and Investments Classified as Available-for-sale Securities Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - Cash and Cash Equivalents and Investments [Member] - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	$ 1,010,863	$ 1,191,065
Unrealized Gains	352	1,296
Unrealized Losses	(1,018)	(124)
Fair Value	1,010,197	1,192,237
Money Market Funds [Member] \| Fair Value Measurements Using Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	65,528	89,509
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	65,528	89,509
U.S. Treasury Securities [Member] \| Fair Value Measurements Using Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	203,112	239,097
Unrealized Gains	196	574
Unrealized Losses	(31)	(7)
Fair Value	203,277	239,664
U.S. Government agency securities \| Fair Value Measurements Using Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	208,017	201,788
Unrealized Gains	29	162
Unrealized Losses	(316)	(38)
Fair Value	207,730	201,912
Commercial Paper [Member] \| Fair Value Measurements Using Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	203,988	289,447
Unrealized Gains	6	96
Unrealized Losses	(130)	(26)
Fair Value	203,864	289,517
Asset-backed securities [Member] \| Fair Value Measurements Using Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	7,633	7,579
Unrealized Gains	0	7
Unrealized Losses	(2)	0
Fair Value	7,631	7,586
Corporate Obligations [Member] \| Fair Value Measurements Using Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Amortized Cost	322,585	363,645
Unrealized Gains	121	457
Unrealized Losses	(539)	(53)
Fair Value	$ 322,167	$ 364,049

Fair Value Measurements - Summary of Fair Value of Financial Assets Consists of Cash Equivalents and Investments Classified as Available-for-sale Securities Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - Cash and Cash Equivalents and Investments [Member] - USD ($)
$ in Thousands

Mar. 31, 2026

Dec. 31, 2025

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

Amortized Cost

$ 1,010,863

$ 1,191,065

Unrealized Gains

352

1,296

Unrealized Losses

(1,018)

(124)