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Stock Incentive Plans - Inducement plan (Details) - shares | Sep. 30, 2023 | Jun. 02, 2023 | Feb. 01, 2023 | Jan. 31, 2023 | Jan. 30, 2023 | Feb. 17, 2022
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2022 Inducement Stock Incentive Plan |  |  |  |  |  |
Stock Incentive Plans |  |  |  |  |  |
Number of shares authorized |  |  |  | 700,000 | 300,000 | 300,000
Number of grants issued | 538,100 |  |  |  |  |
2015 Amended and Restated Stock Incentive Plan |  |  |  |  |  |
Stock Incentive Plans |  |  |  |  |  |
Number of shares issued |  |  | 855,000 |  |  |
Number of additional shares authorized |  | 4,300,000 |  |  |  |
Number of stock options remain outstanding | 755,000 |  |  |  |  |

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