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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
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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% |  |

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