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Stockholders' Equity - Performance-Based Restricted Stock Units (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2022
Stockholders' Equity Capital Structure [Line Items] |  |  |
Earnout target percentage (as a percent) |  | 0.00% |
Actual total shareholder return (as a percent) |  | (47.25%) |
Relative total shareholder return ranking (as a percent) |  | 3.70% |
Market-Based PRSUs |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Equity instruments granted (in shares) | 324,165 |  |
Equity instruments granted, weighted average grant date fair value | $ 15.0 |  |
Earnout target percentage (as a percent) |  | 0.00% |
Relative total shareholder return ranking (as a percent) |  | 1.50% |
PRSUs |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Earnout target percentage (as a percent) |  | 0.00% |
Term of the performance period (in years) | 1 year |  |
Relative total shareholder return ranking (as a percent) |  |  | 2.90%
PRSUs | Tranche One |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Award vesting percentage | 33.33% |  |
PRSUs | Tranche Two |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Award vesting percentage | 66.67% |  |
PRSUs | Minimum |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Earnout target percentage (as a percent) | 0 |  |
PRSUs | Maximum |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Earnout target percentage (as a percent) | 2 |  |
PRSUs | Maximum | Executive Employment Terminates due to Death by end of 2024 |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Earnout target percentage (as a percent) | 1 |  |
PRSUs | Maximum | Executive Employment Terminates due to Disability by end of 2024 |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Earnout target percentage (as a percent) | 0.50 |  |
PRSUs | Maximum | Shareholder for Performance Any Period is Negative |  |  |
Stockholders' Equity Capital Structure [Line Items] |  |  |
Earnout target percentage (as a percent) | 1 |  |

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