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Stock-Based Compensation - Summary of stock option activity (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Stock-Based Compensation and Warrants |  |  |  |
Options granted (in shares) | 0 | 0 |  |
Stock Option |  |  |  |
Stock-Based Compensation and Warrants |  |  |  |
Options, Beginning balance | 4,375,781 | 2,295,898 | 2,295,898 |
Options granted (in shares) |  |  | 2,195,000 |
Options, Expired |  |  | (104,270) |
Options, Forfeited |  |  | (10,847) |
Options, Ending balance | 4,375,781 |  | 4,375,781 | 2,295,898
Options, Exercisable | 1,611,399 |  |  |
Weighted Average Exercise Price, Beginning balance | $ 1.80 | $ 3.53 | $ 3.53 |
Weighted Average Exercise Price, Granted |  |  | 0.59 |
Weighted Average Exercise Price, Expired |  |  | 14.73 |
Weighted Average Exercise Price, Forfeited |  |  | 1.11 |
Weighted Average Exercise Price, Ending balance | 1.80 |  | $ 1.80 | $ 3.53
Weighted Average Exercise Price, Exercisable | $ 3.80 |  |  |
Weighted Average Remaining Contractual Life, Outstanding | 7 years 5 months 12 days |  | 7 years 8 months 12 days | 6 years 5 months 8 days
Weighted Average Remaining Contractual Life, Exercisable | 5 years 7 months 2 days |  |  |
Grant date fair value of options granted |  |  | $ 873,140 |
Weighted average grant date fair value |  |  | $ 0.40 |

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