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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Share-Based Payment Arrangement, Employee [Member]
Preferred Stock [Member]
Share-Based Payment Arrangement, Employee [Member]
Common Stock [Member]
Share-Based Payment Arrangement, Employee [Member]
Additional Paid-in Capital [Member]
Share-Based Payment Arrangement, Nonemployee [Member]
Preferred Stock [Member]
Share-Based Payment Arrangement, Nonemployee [Member]
Common Stock [Member]
Share-Based Payment Arrangement, Nonemployee [Member]
Additional Paid-in Capital [Member]
Share-Based Payment Arrangement, Nonemployee [Member]
Retained Earnings [Member]
Share-Based Payment Arrangement, Nonemployee [Member]
Series B Private Placement Warrants [Member]
Preferred Stock [Member]
Series B Private Placement Warrants [Member]
Common Stock [Member]
Series B Private Placement Warrants [Member]
Additional Paid-in Capital [Member]
Series B Private Placement Warrants [Member]
Retained Earnings [Member]
Series B Private Placement Warrants [Member]
A-1 Warrants [Member]
Preferred Stock [Member]
A-1 Warrants [Member]
Common Stock [Member]
A-1 Warrants [Member]
Additional Paid-in Capital [Member]
A-1 Warrants [Member]
Retained Earnings [Member]
A-1 Warrants [Member]
A-2 Warrants [Member]
Preferred Stock [Member]
A-2 Warrants [Member]
Common Stock [Member]
A-2 Warrants [Member]
Additional Paid-in Capital [Member]
A-2 Warrants [Member]
Retained Earnings [Member]
A-2 Warrants [Member]
Director [Member]
Preferred Stock [Member]
Director [Member]
Common Stock [Member]
Director [Member]
Additional Paid-in Capital [Member]
Director [Member]
Retained Earnings [Member]
Director [Member]
Series C Preferred Stock [Member]
Preferred Stock [Member]
Series C Preferred Stock [Member]
Common Stock [Member]
Series C Preferred Stock [Member]
Additional Paid-in Capital [Member]
Series C Preferred Stock [Member]
Retained Earnings [Member]
Series C Preferred 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]
Conversion of Series C Preferred Stock to Common Stock [Member]
Additional Paid-in Capital [Member]
Conversion of Series C Preferred Stock to Common Stock [Member]
Retained Earnings [Member]
Conversion of Series C Preferred Stock to Common Stock [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2020                                                                             0 1,194      
Balance at Dec. 31, 2020                                                                             $ 0 $ 418 $ 147,963 $ (136,063) $ 12,318
Net loss                                                                                   (5,824) (5,824)
Issuance of warrants                                                                                 13   13
Issuance of common stock, net of offering costs (in shares)                                                                             0 76      
Issuance of common stock, net of offering costs                                                                             $ 0 $ 27 1,749 0 1,776
Issuance of RSUs $ 0 $ 2 $ (2) $ 0 $ 3 $ 217 $ 0 $ 220                                                                      
Issuance of RSUs (in shares)   5   0 9                                                                            
Issuance of Series B Preferred Stock and common stock warrants, net of offering costs (in shares)                                                                             15 0      
Issuance of Series B Preferred Stock and common stock warrants, net of offering costs                                                                             $ 735 $ 0 0 0 735
Conversion of preferred stock to common stock (in shares)                                                                             (1) 81      
Conversion of Series B Preferred Stock                                                                           $ 0 $ (55) $ (28) (27) 0 0
Conversion of Preferred Stock to common stock                                                                           0 $ 55 $ 28 27 0 0
Beneficial conversion feature upon issuance of preferred stock                                                                                 735   735
Deemed dividend from beneficial conversion feature of preferred stock                                                                                 (735)   (735)
Stock-based compensation expense related to employee and director stock options                                                                                 693   693
Stock-based compensation expense related to non-employee stock options                                                                                 240   240
Balance (in shares) at Dec. 31, 2021                                                                             14 1,365      
Balance at Dec. 31, 2021                                                                             $ 680 $ 478 150,900 (141,887) 10,171
Net loss                                                                                   (10,608) (10,608)
Issuance of common stock, net of offering costs (in shares)                                                         3 0                          
Issuance of common stock, net of offering costs                                                         $ 2,054 $ 0 $ 0 $ 0 $ 2,054                    
Issuance of RSUs                                               $ 0 $ 1 $ (1) $ 0 $ 0                              
Issuance of RSUs (in shares)                                               0 3                                    
Conversion of Series B Preferred Stock                                                                           (632) 110 (56) (54) 0 0
Conversion of Preferred Stock to common stock                                                                           632 $ (110) $ 56 54 0 0
Stock-based compensation expense related to employee and director stock options                                                                                 220   220
Reclassification of Private Placement Warrants                 $ 0 $ 0 $ 7,502 $ 0 $ 7,502                                                       1,851   1,851
Conversion of Series B Preferred Stock to common stock (in shares)                                                                   (1) 159       (2) 161      
Issuance of common stock in connection with exercise of warrants, net of offering costs (in shares)                                                                             0 328      
Issuance of common stock in connection with exercise of warrants, net of offering costs                                                                             $ 0 $ 115 171 0 286
Shares issued for reverse stock split due to rounding feature (in shares)                                                                             0 19      
Reclassification of equity to liability related to 2022 Warrant Reprice Transaction (see Note 14)                                                                             $ 0 $ 0 (3,825) 0 (3,825)
Modification of common stock warrants                                                                             0 0 1,922 0 1,922
Down round feature adjustment related to Series B Preferred Stock                                                                             $ 0 $ 0 5,657 (5,657) 0
Issuance of common stock warrants, net of offering costs                           $ 176 $ 0 $ 0 $ 0 $ 176 $ 805 $ 0 $ 0 $ 0 $ 805                                        
Conversion of Series C Preferred Stock to common stock                                                                   $ (632) $ 2 $ 630 $ 0 $ 0          
Balance (in shares) at Dec. 31, 2022                                                                             14 2,035      
Balance at Dec. 31, 2022                                                                             $ 2,973 $ 652 $ 165,081 $ (158,152) $ 10,554