v3.26.1
Stock-Based Compensation - Option activity (Details) - USD ($)
 9 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Employee Stock Option      
Number of Shares      
Balance, Beginning (in shares) 3,611,362    
Granted (in shares) 3,298,887    
Forfeited (in shares) (480,720)    
Expired (in shares) (225,627)    
Balance, Ending (in shares) 6,203,902   3,611,362
Vested and exercisable (in shares) 2,803,983    
Weighted Average Exercise Price      
Balance, Beginning (in dollars per share) $ 11.36    
Granted (in dollars per share) 1.18    
Forfeited (in dollars per share) 1.34    
Expired (in dollars per share) 11.18    
Balance, Ending (in dollars per share) 6.73   $ 11.36
Vested and exercisable (in dollars per share) $ 13.17    
Weighted Average Remaining Contractual Term (Years)      
Balance-Remaining contractual term 8 years 2 months 12 days   7 years 7 months 6 days
Vested and exercisable -Remaining contractual term 7 years    
Aggregate intrinsic value, Outstanding $ 0    
Grant date fair value of options (in dollars per share) $ 1.05 $ 4.6  
Performance-based stock options      
Number of Shares      
Balance, Beginning (in shares) 125,500    
Forfeited (in shares) (90,500)    
Expired (in shares) (5,000)    
Balance, Ending (in shares) 30,000   125,500
Vested and exercisable (in shares) 30,000    
Weighted Average Exercise Price      
Balance, Beginning (in dollars per share) $ 12.92    
Forfeited (in dollars per share) 6.78    
Expired (in dollars per share) 28.8    
Balance, Ending (in dollars per share) 28.8   $ 12.92
Vested and exercisable (in dollars per share) $ 28.8    
Weighted Average Remaining Contractual Term (Years)      
Balance-Remaining contractual term 5 years 6 months   7 years 7 months 6 days
Vested and exercisable -Remaining contractual term 5 years 6 months