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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
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.