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One-Time Employee Termination Benefits - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Severance costs $ 6.7    
Research and development      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Severance costs   $ 1.8 $ 0.2
General and administrative      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Severance costs   $ 3.9 $ 0.3