Quarterly report [Sections 13 or 15(d)]

Equity-based Compensation - Narrative (Details)

v3.25.3
Equity-based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 15 Months Ended 42 Months Ended
Jan. 31, 2025
tranche
$ / shares
shares
May 31, 2024
tranche
$ / shares
shares
Sep. 30, 2023
tranche
$ / shares
shares
Sep. 30, 2021
shares
May 31, 2025
$ / shares
shares
Sep. 30, 2025
USD ($)
tranche
$ / shares
shares
Dec. 31, 2018
shares
Mar. 31, 2022
Sep. 30, 2025
USD ($)
tranche
$ / shares
shares
Dec. 31, 2024
$ / shares
May 22, 2024
shares
May 30, 2023
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Granted (in shares)           0            
Weighted average exercise price (in dollars per share) | $ / shares           $ 81.47     $ 81.47 $ 81.47    
Options granted (in shares)           0            
Options, intrinsic value (in dollars per share) | $ / shares           $ 0            
Unrecognized compensation cost | $           $ 0.7     $ 0.7      
Chief Executive Officer                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options granted (in shares) 100,000         0            
Unrecognized compensation cost | $           $ 0.8     0.8      
ESPP purchase rights                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Offering period         6 months              
Employee stock purchase plan shares (in shares)         11,876              
Shares issued, weighted average price per share (in dollars per share) | $ / shares         $ 10.57              
Stock options                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration period     10 years 10 years                
Granted (in shares)     416,667                  
Number of tranches | tranche     4                  
Weighted average exercise price (in dollars per share) | $ / shares     $ 109.27                  
Requisite service period     5 years 6 months                  
Weighted average period           3 years 6 months            
Total unrecognized compensation cost | $           $ 0.0     0.0      
Stock options | Chief Executive Officer                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration period 10 years                      
Number of tranches | tranche 4                      
Weighted average exercise price (in dollars per share) | $ / shares $ 120.00                      
Weighted average period 4 years 2 months 12 days         3 years 4 months 24 days            
RSUs                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Weighted average period           2 years 1 month 6 days            
Total unrecognized compensation cost | $           $ 8.1     $ 8.1      
Vesting period               4 years 3 years      
Time-based incentive units                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Vesting period             4 years          
2021 Omnibus Incentive Plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares reserved for issuance (in shares)       408,355   2,662,075     2,662,075   1,100,000 833,333
Annual increase of shares authorized for issuance       1.00%                
2021 Employee Stock Purchase Plan | ESPP purchase rights                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares reserved for issuance (in shares)       102,088   422,475     422,475      
Annual increase of shares authorized for issuance       1.00%                
Offering period       6 months                
Percentage on share price issued       85.00%                
2018 Stock and Incentive Compensation Plan | Incentive Units                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares reserved for issuance (in shares)             16,475,735          
Interim CEO Award | RSUs                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Expiration period   5 years                    
Granted (in shares)   150,000                    
Number of tranches | tranche   10                    
Weighted average exercise price (in dollars per share) | $ / shares   $ 29.50                    
Requisite service period   2 years 10 months 24 days                    
Weighted average period           1 year 7 months 6 days            
Number of tranches | tranche           2     2      
Unrecognized compensation cost | $           $ 0.2     $ 0.2