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Accounting for Stock-Based Compensation - Additional Information (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Mar. 01, 2025 USD ($) Director shares | Jun. 01, 2024 USD ($) shares | Mar. 01, 2024 USD ($) shares | Sep. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2025 shares | Mar. 31, 2025 shares | Sep. 30, 2024 shares | Sep. 30, 2025 USD ($) Item $ / shares shares | Sep. 30, 2024 Item $ / shares shares | Dec. 31, 2024 Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Reversal of stock-based compensation expense | $ |  |  |  | $ 4,000,000 |  |  |  |  |  |
Employee service share-based compensation, unrecognized compensation costs on nonvested awards | $ |  |  |  | $ 14,000,000 |  |  |  | $ 14,000,000 |  |
Employee service share-based compensation total compensation cost not yet recognized, period for recognition |  |  |  |  |  |  |  | 22 months |  |
Employee service share-based compensation, nonvested awards, modifications to awards | Item |  |  |  |  |  |  |  | 0 | 0 |
Share exercised | shares |  |  |  | 0 |  |  | 0 | 0 | 0 |
Employee Stock Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee service share-based compensation total compensation cost not yet recognized, period for recognition |  |  |  |  |  |  |  | 21 months |  |
Employee service share-based compensation, unrecognized compensation costs on nonvested stock options | $ |  |  |  | $ 2,000,000 |  |  |  | $ 2,000,000 |  |
Weighted-average grant date fair value of stock options | $ / shares |  |  |  |  |  |  |  | $ 2.27 | $ 2.19 |
Share Price | $ / shares |  |  |  | $ 3.21 |  |  |  | $ 3.21 |  |
Restricted Stock and RSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee service share-based compensation total compensation cost not yet recognized, period for recognition |  |  |  |  |  |  |  | 22 months |  |
Employee service share-based compensation, unrecognized compensation costs on nonvested awards other than options | $ |  |  |  | $ 12,000,000 |  |  |  | $ 12,000,000 |  |
Restricted Stock, Performance-Based Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by payment award, performance objective measurement period |  |  |  |  |  |  |  | 3 years |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation, number of grants | shares |  |  |  |  |  | 777,413 |  |  |  |
Number of directors elected to defer the receipt of RSUs granted | Director | 7 |  |  |  |  |  |  |  |  | 6
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement award vesting rights |  |  |  |  |  |  |  | one-third increments on each of the first three anniversaries of the award date |  |
Share-based compensation, number of grants | shares |  |  |  | 0 | 27,000 | 2,636,000 |  |  |  |
Plan 2009 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement award vesting rights |  |  |  |  |  |  |  | one-third increments on each of the first three anniversaries of the option grant date |  |
Contractual term of option granted |  |  |  |  |  |  |  | 10 years |  |
Unissued common stock reserved for grants | shares |  |  |  | 8,684,274 |  |  |  | 8,684,274 |  |
Plan 2009 | Restricted Stock Units (RSUs) | Non-management Directors |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation, number of grants | shares | 59,801 |  | 62,718 |  |  |  |  |  |  |
Fair value of units granted | $ | $ 180,000 |  | $ 180,000 |  |  |  |  |  |  |
Plan 2009 | Restricted Stock Units (RSUs) | New Non-Management Director |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation, number of grants | shares |  | 62,718 |  |  |  |  |  |  |  |
Fair value of units granted | $ |  | $ 248,000 |  |  |  |  |  |  |  |
Performance-Based Awards Granted On March 1, 2018 | Restricted Stock, Performance-Based Units | Other Senior Excecutives |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement award vesting rights, percentage | 21.00% |  |  |  |  |  |  |  |  |
Performance-Based Awards Granted On March 1, 2018 | Restricted Stock, Performance-Based Units | Chief Executive Officer And Chief Financial Officer |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement award vesting rights, percentage | 16.80% |  |  |  |  |  |  |  |  |

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