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Stock-Based Compensation - Equity Incentive Plan (Details)
1 Months Ended 3 Months Ended 9 Months Ended 33 Months Ended
Apr. 22, 2024
USD ($)
Apr. 17, 2024
USD ($)
shares
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Apr. 16, 2024
USD ($)
May 17, 2021
RSUs                  
Intrinsic value           $ 34,300,000      
Total stock-based compensation expense $ 14,000,000.0     $ 13,675,000 $ 10,775,000 $ 63,337,000 $ 14,359,000    
Monte Carlo Simulation | Risk-free interest rate                  
RSUs                  
Warrants, measurement input                 0.0164
Restricted stock units outstanding                  
RSUs                  
Vesting period           4 years      
Granted (in shares) | shares           1,229,226      
Restricted stock units outstanding | Chief Executive Officer                  
RSUs                  
Granted (in shares) | shares   125,216              
Total stock-based compensation expense       $ 1,300,000   $ 2,400,000      
Restricted stock units outstanding | Chief Executive Officer | Monte Carlo Simulation                  
RSUs                  
Aggregate grant date fair value   $ 14,300,000              
Restricted stock units outstanding | Chief Executive Officer | Monte Carlo Simulation | Risk-free interest rate                  
RSUs                  
Warrants, measurement input   0.0476              
Restricted stock units outstanding | Chief Executive Officer | Monte Carlo Simulation | Expected volatility                  
RSUs                  
Warrants, measurement input   0.57              
Restricted stock units outstanding | Chief Executive Officer | Monte Carlo Simulation | Expected term (in years)                  
RSUs                  
Warrants, measurement input   2.7              
Stock options                  
RSUs                  
Vesting period           4 years      
Expiration period           10 years      
Intrinsic value     $ 3,000,000.0            
Total stock-based compensation expense   $ 11,400,000           $ 0  
Stock options | Chief Executive Officer                  
RSUs                  
Vesting period           1 year      
Restricted Stock Units, Double Trigger Awards                  
RSUs                  
Cumulative stock-based compensation expense adjustment   $ 2,600,000              
Minimum | Monte Carlo Simulation | Expected volatility                  
RSUs                  
Warrants, measurement input                 0.50
Minimum | Restricted stock units outstanding                  
RSUs                  
Vesting period           3 years      
Minimum | Restricted stock units outstanding | Chief Executive Officer                  
RSUs                  
Award vesting percentage   0.00%              
Minimum | Stock options                  
RSUs                  
Vesting period           3 years      
Maximum | Monte Carlo Simulation | Expected volatility                  
RSUs                  
Warrants, measurement input                 0.65
Maximum | Restricted stock units outstanding                  
RSUs                  
Vesting period           4 years      
Maximum | Restricted stock units outstanding | Chief Executive Officer                  
RSUs                  
Award vesting percentage   200.00%              
Maximum | Stock options                  
RSUs                  
Vesting period           4 years      
Equity Incentive Plan                  
RSUs                  
Authorized amount (in shares) | shares       4,550,353   4,550,353      
Increase in shares authorized to be issued (in shares) | shares           5,400,000      
Percentage of outstanding shares           0.05