v3.26.1
Stock-Based Compensation - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
item
$ / shares
shares
Mar. 31, 2025
USD ($)
Mar. 31, 2026
USD ($)
item
$ / shares
shares
Mar. 31, 2025
USD ($)
Sep. 30, 2022
shares
Sep. 30, 2021
USD ($)
shares
Mar. 12, 2026
shares
Sep. 30, 2025
shares
Stock-Based Compensation                
Stock-based compensation | $ $ 3,942,000 $ 3,834,000 $ 9,230,000 $ 9,142,000        
Financial performance metric | item 2   2          
Cumulative adjusted EBITDA during performance period, percentage 65.00%   65.00%          
Cumulative revenue during performance period, percentage 35.00%   35.00%          
Performance period     2 years          
Award settlement period     60 days          
Threshold performance, percentage     0.00%          
Nispera | Restricted Stock Units                
Stock-Based Compensation                
Stock-based compensation | $     $ 6,900,000          
Granted (in shares)     0          
Class B units issued (in shares)         531,202      
Minimum                
Stock-Based Compensation                
Award vesting percentage     50.00%          
Maximum                
Stock-Based Compensation                
Award vesting percentage     200.00%          
The Option Plan                
Stock-Based Compensation                
Shares outstanding, options (in shares) 1,397,309   1,397,309          
Unrecognized stock compensation expense | $ $ 0   $ 0          
2021 Incentive Award Plan                
Stock-Based Compensation                
Class A common stock reserved (in shares)           9,500,000    
Additional shares authorized for issuance             6,700,000  
Employee Stock Option                
Stock-Based Compensation                
Stock-based compensation | $           $ 0    
Employee Stock Option | The Option Plan                
Stock-Based Compensation                
Options expiration period (in years)     10 years          
Options outstanding, weighted average exercise price per share (usd per share) | $ / shares $ 2.45   $ 2.45          
Restricted Stock Units                
Stock-Based Compensation                
Shares outstanding (in shares) 1,769,760   1,769,760         2,232,320
Deferred revenue | $ $ 16,800,000   $ 16,800,000          
Granted (in shares)     674,065          
Restricted Stock Units | 2021 Incentive Award Plan                
Stock-Based Compensation                
Service requirement (in years)     3 years          
Non Qualified Stock Options                
Stock-Based Compensation                
Service requirement (in years)     3 years          
Granted (in shares)     230,440          
Non Qualified Stock Options | 2021 Incentive Award Plan                
Stock-Based Compensation                
Unrecognized stock compensation expense | $ $ 4,900,000   $ 4,900,000          
Granted (in shares)     657,313          
Performance Share Units                
Stock-Based Compensation                
Shares outstanding (in shares) 979,132   979,132          
Deferred revenue | $ $ 8,400,000   $ 8,400,000          
Granted (in shares)     511,997          
Rounds of grants | item 2   2