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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock Employees | Common Stock Executive Officer | Common Stock Consultants | Common Stock Director | Common Stock | Paid-in Capital Employees | Paid-in Capital Executive Officer | Paid-in Capital Consultants | Paid-in Capital | Accumulated Deficit | Noncontrolling Interest | Employees | Executive Officer | Consultants | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2021 |  |  |  |  | $ 20 |  |  |  | $ 103,039 | $ (28,779) | $ 662 |  |  |  | $ 74,942
Balances (in shares) at Dec. 31, 2021 |  |  |  |  | 19,571,119 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to stock options and restricted stock |  |  |  |  |  |  |  |  | 534 |  |  |  |  |  | 534
Shares issued in connection with stock grant |  |  |  |  |  | $ 50 | $ 281 |  |  |  |  | $ 50 | $ 281 |  |
Shares issued in connection with stock grant (in shares) | 33,557 | 178,727 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with restricted stock grants (in shares) |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with sale transaction |  |  |  |  |  |  |  | $ 33 | 97 |  |  |  |  | $ 33 | 97
Shares issued in connection with sale transaction (in shares) |  |  | 20,064 |  | 65,275 |  |  |  |  |  |  |  |  |  |
Shares repurchased in exchange for withholding taxes |  |  |  |  |  | (357) | $ (85) |  |  |  |  | (357) | $ (85) |  |
Shares repurchased in exchange for withholding taxes (in shares) | (240,000) | (53,882) |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  | (4,018) | (1,338) |  |  |  | (5,356)
Balances at Dec. 31, 2022 |  |  |  |  | $ 20 |  |  |  | 103,592 | (32,797) | (676) |  |  |  | 70,139
Balances (in shares) at Dec. 31, 2022 |  |  |  |  | 19,624,860 |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to stock options and restricted stock |  |  |  |  |  |  |  |  | 161 |  |  |  |  |  | 161
Shares issued in connection with stock grant |  |  |  |  |  | $ 10 |  |  |  |  |  | $ 10 |  |  |
Shares issued in connection with stock grant (in shares) | 7,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with restricted stock grants (in shares) |  |  |  | 40,000 |  |  |  |  |  |  |  |  |  |  |
Shares issued in connection with sale transaction |  |  |  |  |  |  |  | $ 45 |  |  |  |  |  | $ 45 |
Shares issued in connection with sale transaction (in shares) |  |  | 66,668 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued on exercises of stock options, net of shares surrendered for cashless exercises |  |  |  |  |  |  |  |  | 27 |  |  |  |  |  | 27
Shares issued on exercises of stock options, net of shares surrendered for cashless exercises (in shares) |  |  |  |  | 61,225 |  |  |  |  |  |  |  |  |  |
Contra-revenue related to warrants granted to licensee |  |  |  |  |  |  |  |  | 26 |  |  |  |  |  | 26
Forfeitures of restricted stock grants |  |  |  |  | (5,000) |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  | (21,052) | (1,185) |  |  |  | (22,237)
Balances at Dec. 31, 2023 |  |  |  |  | $ 20 |  |  |  | $ 103,861 | $ (53,849) | $ (1,861) |  |  |  | $ 48,171
Balances (in shares) at Dec. 31, 2023 |  |  |  |  | 19,795,053 |  |  |  |  |  |  |  |  |  |

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