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Stock-Based Compensation - Additional information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2023
USD ($)
Tranche
shares
Sep. 30, 2025
USD ($)
shares
Jun. 30, 2025
shares
Sep. 30, 2024
USD ($)
shares
Jun. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
Tranche
shares
Sep. 30, 2025
USD ($)
Tranche
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Stock-based compensation   $ 7.2   $ 13.4     $ 23.0 $ 27.2  
Option Strike Price | $ / shares             $ 23.16    
Chief Executive Officer [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Stock-based compensation             $ 1.9    
Granted, Shares | shares             358,001    
Fair value of the options on the grant date             $ 10.5    
Stock options vested | shares     119,321            
Chief Executive Officer [Member] | Minimum [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods             3 years    
Chief Executive Officer [Member] | Maximum [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods             7 years    
Employee Stock Option | Chief Executive Officer [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Share based payment arrangement number of tranches | Tranche             9    
Restricted Stock Units (RSUs) [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   34.7         $ 34.7    
Unrecognized stock-based compensation cost period for recognition             2 years 10 months 24 days    
Nonvested options, Shares | shares       50,000 333,275     50,000  
Incremental stock-based compensation expense upon modification of unvested RSUs         $ 1.0        
Weighted average modification-date fair value per award | $ / shares         $ 5.36        
Restricted Stock Units (RSUs) [Member] | October 2023 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Share based payment arrangement number of tranches | Tranche 6                
Granted, Shares | shares 71,844                
Fair value of the options on the grant date $ 0.2                
Restricted Stock Units (RSUs) [Member] | January 2023 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Share based payment arrangement number of tranches | Tranche           6      
Granted, Shares | shares           629,454      
Fair value of the options on the grant date           $ 3.0      
Restricted Stock Units (RSUs) [Member] | Minimum [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods determined by valuation         1 year        
Restricted Stock Units (RSUs) [Member] | Minimum [Member] | October 2023 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods             2 years    
Restricted Stock Units (RSUs) [Member] | Minimum [Member] | January 2023 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods             2 years    
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods determined by valuation         2 years        
Restricted Stock Units (RSUs) [Member] | Maximum [Member] | October 2023 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods             3 years    
Restricted Stock Units (RSUs) [Member] | Maximum [Member] | January 2023 [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Derived service periods             3 years    
Stock Compensation Plan [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   1.2         $ 1.2    
Unrecognized stock-based compensation cost period for recognition             2 years 8 months 12 days    
Stock Compensation Plan [Member] | Dave Two Thousand and Seventeen Plan [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Expiration period             10 years    
Vesting period             4 years    
Performance-Based Restricted Stock Units [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Stock-based compensation                 $ 5.6
Granted, Shares | shares             185,055    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 13.0         $ 13.0    
Unrecognized stock-based compensation cost period for recognition             1 year 7 months 6 days    
Nonvested options, Shares | shares   291,512         291,512   338,052
Incremental stock-based compensation expense upon modification of unvested RSUs       $ 0.4          
Share-based payment arrangement, plan modification equity instruments other than options, vested in period | shares             50,000    
Performance-Based Restricted Stock Units [Member] | Minimum [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Non-option equity units percentage of target shares granted             0.00%    
Performance-Based Restricted Stock Units [Member] | Maximum [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                  
Non-option equity units percentage of target shares granted             150.00%