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Stock Based Compensation - Narrative (Details) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 28, 2023 shares | Apr. 18, 2023 USD ($) shares | Jan. 03, 2023 | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Apr. 17, 2023 $ / shares | Dec. 31, 2021 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stockholders' equity note, stock split, conversion ratio |  |  | 0.06667 |  |  |  |
Number of options granted (in shares) | shares |  |  |  | 0 | 0 |  |
Exercisable number of options, vested (in shares) | shares |  |  |  | 3,336 | 3,332 |  |
Vested stock options expired (in shares) | shares |  |  |  | 6,668 | 501 |  |
Forfeited (in shares) | shares |  |  |  |  | 10,000 |  |
Number of stock options outstanding (in shares) | shares |  |  |  | 10,000 | 16,668 |  | 27,169
Weighted average exercise price, outstanding and exercisable (in dollars per share) | $ / shares |  |  |  | $ 48.75 | $ 29.25 |  | $ 113.63
Weighted average remaining contractual term |  |  |  | 7 years 6 months |  |  |
Intrinsic value of exercisable options |  |  |  | $ 0 | $ 0 |  |
Stock option compensation expense, forfeiture |  |  |  |  | 85,000 |  |
Unrecognized stock-based compensation expense for stock options |  |  |  | 61,000 |  |  |
Outstanding stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  |  |  |  | 61,000 |  |
Expense gross |  |  |  |  | (146,000) |  |
Stock option compensation expense, forfeiture |  |  |  |  | $ 85,000 |  |
Period of recognition |  |  |  |  | 6 months |  |
Outstanding stock options | General and Administrative Expense |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  |  |  | 124,000 | $ 125,000 |  |
Outstanding stock options | Research and Development |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  |  |  |  | (64,000) |  |
Unvested restricted stock awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  |  |  | $ 0 | 0 |  |
Unvested restricted shares outstanding (in shares) | shares |  |  |  | 0 |  |  |
Unrecognized stock-based compensation expense for other than options |  |  |  | $ 0 |  |  |
Unvested restricted stock awards | Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vested, restricted shares (in shares) | shares | 42 |  |  |  |  |  |
Vesting period | 10 years |  |  |  |  |  |
RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  |  |  | $ 380,000 | 0 |  |
Unvested restricted shares outstanding (in shares) | shares |  |  |  | 0 |  |  |
Unrecognized stock-based compensation expense for other than options |  |  |  | $ 0 |  |  |
Granted, restricted shares (in shares) | shares |  | 177,564 |  |  |  |  |
RSUs | Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vested, restricted shares (in shares) | shares | 1,929 |  |  |  |  |  |
2019 Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for grant (in shares) | shares |  |  |  | 3 |  |  |
Stock option compensation expense |  |  |  | $ 504,000 | 61,000 |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  | $ 2.14 |
2019 Equity Incentive Plan | Research and Development |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  |  |  | 0 | (64,000) |  |
2019 Equity Incentive Plan | Outstanding stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  |  |  | 124,000 | 61,000 |  |
2019 Equity Incentive Plan | RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option compensation expense |  | $ 380,000 |  | $ 380,000 | $ 0 |  |

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