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Stockholders' Equity - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 23, 2023 | Apr. 26, 2022 | Apr. 20, 2022 | Apr. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Other disclosures |  |  |  |  |  |
Compensation expense |  |  |  |  | $ 220 | $ 720
Operating cost |  |  |  |  |  | $ 620
Authorized number of shares |  |  |  |  | 51,000,000 |
Number of common stock shares authorized |  |  |  |  | 50,000,000 | 50,000,000
Authorized number of shares of preferred stock |  |  |  |  | 1,000,000 | 1,000,000
Contra-revenue related to warrants granted to licensee |  |  |  |  | $ 26 |
Employee |  |  |  |  |  |
Other disclosures |  |  |  |  |  |
Compensation expense |  |  |  |  | $ 20 | $ 410
Non Management Directors |  |  |  |  |  |
Other disclosures |  |  |  |  |  |
Compensation expense |  |  |  |  |  | $ 310
Employee Stock Option [Member] |  |  |  |  |  |
Number of Options |  |  |  |  |  |
Outstanding, beginning balance (in shares) |  |  |  |  | 5,614,310 |
Granted (in shares) |  |  |  |  | 200,000 |
Exercised (in shares) |  |  |  |  | (87,750) |
Expired/Forfeited (in shares) |  |  |  |  | (578,020) |
Outstanding, ending balance (in shares) |  |  |  |  | 5,148,540 | 5,614,310
Exercisable (in shares) |  |  |  |  | 1,398,540 |
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding, beginning balance (in dollars per share) |  |  |  |  | $ 2.12 |
Granted (in dollars per share) |  |  |  |  | 1.51 |
Exercised (in dollars per share) |  |  |  |  | 0.80 |
Expired/Forfeited (in dollars per share) |  |  |  |  | 2.96 |
Outstanding, ending balance (in dollars per share) |  |  |  |  | 2.03 | $ 2.12
Exercisable (in dollars per share) |  |  |  |  | $ 2.88 |
Other disclosures |  |  |  |  |  |
Outstanding Weighted Average Remaining Contractual Life (in Years) |  |  |  |  | 4 years 3 months 3 days | 4 years 9 months 3 days
Exercisable Weighted Average Remaining Contractual Life (in Years) |  |  |  |  | 1 year 7 months 28 days |
Vested (in shares) |  |  |  |  | 135,000 |
Compensation expense |  |  |  |  | $ 100 | $ 500
Unrecognized compensation expense |  |  |  |  |  | $ 100
Weighted average period of recognition |  |  |  |  |  | 1 year 18 days
Employee Stock Option [Member] | Employee |  |  |  |  |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  |  | 380,850 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 1.62 |  |  |
Employee Stock Option [Member] | Non Management Directors |  |  |  |  |  |
Number of Options |  |  |  |  |  |
Granted (in shares) | 100,000 |  |  | 100,000 |  |
Weighted Average Exercise Price |  |  |  |  |  |
Granted (in dollars per share) | $ 1.51 |  |  | $ 1.50 |  |
Other disclosures |  |  |  |  |  |
Vested (in shares) |  |  |  |  | 0 |
Vesting rights (percentage per year) | 50.00% |  |  |  |  |
Employee Stock Option [Member] | Management |  |  |  |  |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  |  | 125,000 |  |  |
Weighted Average Exercise Price |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 1.62 |  |  |
Employee Stock Option [Member] | Consultant |  |  |  |  |  |
Number of Options |  |  |  |  |  |
Granted (in shares) |  | 100,000 |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |
Granted (in dollars per share) |  | $ 1.58 |  |  |  |
Employee Stock Option [Member] | Five year expiration |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Expiration period |  |  |  |  | 5 years |
Employee Stock Option [Member] | Seven year expiration |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Expiration period |  |  |  |  | 7 years |
Employee Stock Option [Member] | Ten year expiration |  |  |  |  |  |
Stockholders' Equity |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |

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