Employee Termination Benefits - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Severance costs	$ 6.5
Research and Development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Severance costs		$ 0.3	$ 0.1	$ 1.6	$ 0.2
General and administrative
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Severance costs		$ 0.9	$ 0.2	$ 2.7	$ 0.2