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Stock-Based Compensation - Stock incentive plan and other information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 05, 2019 | Nov. 02, 2010 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 17, 2020
Stock-Based Compensation |  |  |  |  |  |  |
Unrecognized stock-based compensation expense |  |  | $ 847,000 |  | $ 847,000 |  |
Options, Granted (in shares) |  |  |  |  |  | 0 |
General and administrative expenses and research and development expense | Employees |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Allocated share-based compensation expense |  |  | 184,000 | $ 123,000 | 407,000 | $ 347,000 |
Consultant | General and administrative expenses and research and development expense |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Allocated share-based compensation expense |  |  | $ 44,000 | $ 54,000 | $ 94,000 | $ 161,000 |
2010 Stock Plan |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Share-based payment award, options, outstanding, number |  | 343 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares authorized | 16,000 |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, shares issued |  |  |  |  | 0 |  |
2010 Stock Plan | Board of Directors |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Share-based payment award, options, outstanding, number |  |  | 7,566 |  | 7,566 |  |
Share-based payment award, options, issued, number |  |  | 7,566 |  | 7,566 |  |
2010 Stock Plan | Minimum |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Share-based payment award, options, grants, expired period |  | 5 years |  |  |  |  |
2010 Stock Plan | Maximum |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Share-based payment award, options, grants, expired period |  | 10 years |  |  |  |  |
2020 Stock Plan |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Share-based payment award, options, outstanding, number |  |  | 1,108,535 |  | 1,108,535 |  | 16,000
Share-based compensation arrangement by share-based payment award, number of shares authorized |  |  |  |  | 4,500,000 |  |
Share-based payment award, options, issued, number |  |  | 1,108,535 |  | 1,108,535 |  |

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