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Stock-Based Compensation - Stock incentive plan and other information (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 05, 2019 | Nov. 02, 2010 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2022 | Oct. 31, 2023 | Sep. 17, 2020 | Mar. 20, 2007
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Share-based payment award, options, grants in period, gross |  |  | 0 | 0 |  |  |  |
Unrecognized stock-based compensation expense |  |  | $ 1,100,000 |  |  |  |  |
Class Of Warrant Or Right Outstanding |  |  |  |  |  | 0 |  |
General and administrative expenses | Employees |  |  |  |  |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Allocated share-based compensation expense |  |  | 106,000 | $ 83,000 |  |  |  |
Consultant | Research and Development Expenses |  |  |  |  |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Allocated share-based compensation expense |  |  | $ 54,000 | $ 43,000 |  |  |  |
2007 Stock Plan |  |  |  |  |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Share-based payment award, options, outstanding, number |  |  | 86 |  |  |  |  | 7,143
Share-based payment award, options, issued, number |  |  | 86 |  |  |  |  |
2010 Stock Plan |  |  |  |  |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Share-based payment award, options, outstanding, number |  | 8,572 | 198,540 |  |  |  |  |
Share-based payment award, options, issued, number |  |  | 198,540 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares authorized | 400,000 |  |  |  |  |  |  |
Shares available |  |  | 0 |  |  |  |  |
2010 Stock Plan | Minimum |  |  |  |  |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Share-based payment award, options, grants, expired period |  | 5 years |  |  |  |  |  |
2010 Stock Plan | Maximum |  |  |  |  |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Share-based payment award, options, grants, expired period |  | 10 years |  |  |  |  |  |
2020 Stock Plan |  |  |  |  |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |  |  |  |  |
Share-based payment award, options, outstanding, number |  |  | 4,177,155 |  |  |  | 400,000 |
Share-based payment award, options, issued, number |  |  | 4,177,155 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares authorized |  |  |  |  | 7,000,000 |  |  |

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