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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Employees and Directors [Member] Preferred Stock [Member] | Employees and Directors [Member] Common Stock [Member] | [1] | Employees and Directors [Member] Additional Paid-in Capital [Member] | [1] | Employees and Directors [Member] Retained Earnings [Member] | Employees and Directors [Member] | Director [Member] Preferred Stock [Member] | Director [Member] Common Stock [Member] | [1] | The November 2021 Warrants [Member] Preferred Stock [Member] | The November 2021 Warrants [Member] Common Stock [Member] | [1] | The November 2021 Warrants [Member] Additional Paid-in Capital [Member] | [1] | The November 2021 Warrants [Member] Retained Earnings [Member] | The November 2021 Warrants [Member] | The 2022 Warrant Reprice Transaction [Member] Preferred Stock [Member] | The 2022 Warrant Reprice Transaction [Member] Common Stock [Member] | [1] | The 2022 Warrant Reprice Transaction [Member] Additional Paid-in Capital [Member] | [1] | The 2022 Warrant Reprice Transaction [Member] Retained Earnings [Member] | The 2022 Warrant Reprice Transaction [Member] | The 2023 Private Placement [Member] Preferred Stock [Member] | The 2023 Private Placement [Member] Common Stock [Member] | [1] | The 2023 Private Placement [Member] Additional Paid-in Capital [Member] | [1] | The 2023 Private Placement [Member] Retained Earnings [Member] | The 2023 Private Placement [Member] | May 2023 Warrants [Member] Preferred Stock [Member] | May 2023 Warrants [Member] Common Stock [Member] | [1] | May 2023 Warrants [Member] Additional Paid-in Capital [Member] | [1] | May 2023 Warrants [Member] Retained Earnings [Member] | May 2023 Warrants [Member] | The 2023 Warrant Reprice Transaction [Member] Preferred Stock [Member] | The 2023 Warrant Reprice Transaction [Member] Common Stock [Member] | [1] | The 2023 Warrant Reprice Transaction [Member] Additional Paid-in Capital [Member] | [1] | The 2023 Warrant Reprice Transaction [Member] Retained Earnings [Member] | The 2023 Warrant Reprice Transaction [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] Preferred Stock [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] Common Stock [Member] | [1] | Conversion of Series B Preferred Stock to Common Stock [Member] Additional Paid-in Capital [Member] | [1] | Conversion of Series B Preferred Stock to Common Stock [Member] Retained Earnings [Member] | Conversion of Series B Preferred Stock to Common Stock [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] Preferred Stock [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] Common Stock [Member] | [1] | Conversion of Series C Preferred Stock to Common Stock [Member] Additional Paid-in Capital [Member] | [1] | Conversion of Series C Preferred Stock to Common Stock [Member] Retained Earnings [Member] | Conversion of Series C Preferred Stock to Common Stock [Member] | Series B Preferred Stock [Member] Preferred Stock [Member] | Series B Preferred Stock [Member] Common Stock [Member] | [1] | Series B Preferred Stock [Member] Additional Paid-in Capital [Member] | [1] | Series B Preferred Stock [Member] Retained Earnings [Member] | Series B Preferred Stock [Member] | Series C Preferred Stock [Member] Preferred Stock [Member] | Series C Preferred Stock [Member] Common Stock [Member] | [1] | Series C Preferred Stock [Member] Additional Paid-in Capital [Member] | [1] | Series C Preferred Stock [Member] Retained Earnings [Member] | Series C Preferred Stock [Member] | Preferred Stock [Member] | Common Stock [Member] | [1] | Additional Paid-in Capital [Member] | [1] | Retained Earnings [Member] | Total
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Balance (in shares) at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 1,365 |  |  |
Balance at Dec. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 680 | $ 13 | $ 151,365 | $ (141,887) | $ 10,171
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (10,608) | (10,608)
Stock-based compensation expense related to employee and director stock awards | $ 0 | $ 0 | $ 220 | $ 0 | $ 220 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of director restricted stock awards (in shares) |  |  |  |  |  | 0 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of November 2021 Warrants from liability |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 7,502 | $ 0 | $ 7,502 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 1,851 | 0 | 1,851
Conversion of Preferred Stock to common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2) | 161 |  |  |  | (1) | 159 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversions of preferred stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (110) | $ 2 | $ 108 | $ 0 | $ 0 | $ (632) | $ 2 | $ 630 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 742
Down round feature adjustment related to Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 5,657 | $ (5,657) | $ 0 |  |  |  |  |  |  |  |  |  |
Modification of common stock warrants in connection with 2022 Warrant Reprice Transaction |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,922 | $ 0 | $ 1,922 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with 2022 Warrant Reprice Transaction, net of offering costs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 328 |  |  |
Issuance of common stock in connection with 2022 Warrant Reprice Transaction, net of offering costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 3 | 283 | 0 | 286
Reclassification of July 2020 Warrants and November 2021 Warrants to liability in connection with 2022 Warrant Reprice Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | (3,825) | 0 | (3,825)
Issuance of Series C Preferred Stock and 2022 Warrants, net of offering costs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 0 |  |  |
Issuance of Series C Preferred Stock and 2022 Warrants, net of offering costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,035 | $ 0 | 0 | 0 | 3,035
Shares issued due to Reverse Stock Split rounding feature (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 19 |  |  |
Balance (in shares) at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 2,035 |  |  |
Balance at Dec. 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,973 | $ 20 | 165,713 | (158,152) | 10,554
Net loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | (9,640) | (9,640)
Stock-based compensation expense related to employee and director stock awards | $ 0 | $ 0 | $ 291 | $ 0 | $ 291 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of director restricted stock awards (in shares) |  |  |  |  |  | 0 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Preferred Stock to common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6) | 6,384 |  |  |  | (1) | 277 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversions of preferred stock to common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (295) | $ 64 | $ 231 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,023
Down round feature adjustment related to Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 6,385 | $ (6,385) | $ 0 | $ 0 | $ 0 | $ 672 | $ (672) | $ 0 |  |  |  |  |
Modification of common stock warrants in connection with 2022 Warrant Reprice Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 286 | $ 0 | $ 286 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with 2022 Warrant Reprice Transaction, net of offering costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 25 | $ 76 | $ 0 | $ 101 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Series C Preferred Stock and 2022 Warrants, net of offering costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (728) | $ 3 | $ 725 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of May 2023 Warrants from liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 1,360 | $ 0 | $ 1,360 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of 2023 Private Placement embedded derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 169 | $ 0 | $ 169 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Modification of common stock warrants in connection with 2023 Warrant Reprice Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 193 | $ 0 | $ 193 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with 2023 Warrant Reprice Transaction, net of offering costs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,529 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 | 11,230 |  |  |
Balance at Dec. 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,950 | $ 112 | $ 176,101 | $ (174,849) | $ 3,314
[1] | After giving retroactive effect to a 1-for-35 reverse stock split that became effective November 15, 2022.

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