Segment Information - Schedule Of Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Stock-based compensation	$ 22,036	$ 40,861	$ 43,876	$ 75,037
Research and Development [Member]
Segment Reporting Information [Line Items]
Unallocated stock-based compensation expense	14,100	25,400	26,700	45,600
Stock-based compensation	14,059	25,439	26,685	45,600
General and Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Stock-based compensation	$ 7,977	$ 15,422	$ 17,191	$ 29,437