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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
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]
Conversion of Series B Preferred Stock to Common Stock [Member]
Additional Paid-in Capital [Member]
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]
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]
Series B Preferred Stock [Member]
Preferred Stock [Member]
Series B Preferred Stock [Member]
Common Stock [Member]
Series B Preferred Stock [Member]
Additional Paid-in Capital [Member]
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]
Series C Preferred Stock [Member]
Additional Paid-in Capital [Member]
Series C Preferred Stock [Member]
Retained Earnings [Member]
Series C Preferred Stock [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares)                                         14 1,365      
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                                               (111) (111)
Stock-based compensation expense related to employee and director stock awards                                         $ 0 $ 0 184 0 184
Conversion of Preferred Stock to common stock (in shares)                                         (1) 104      
Conversion of Preferred Stock to common stock                                         $ 71 $ 1 70 0 0
Reclassification of May 2023 Warrants                                         0 0 7,502 0 7,502
Conversion of Preferred Stock to common stock                                         (71) (1) (70) 0 0
Balance at Mar. 31, 2022                                         $ 609 $ 14 159,121 (141,998) 17,746
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 [1]                                                 (2,402)
Conversion of Preferred Stock to common stock         $ 110         $ 0                              
Conversion of Preferred Stock to common stock         (110)         0                              
Balance at Sep. 30, 2022                                         $ 570 $ 18 163,142 (149,946) 13,784
Balance (in shares)                                         13 1,469      
Balance (in shares) at Mar. 31, 2022                                         13 1,469      
Balance at Mar. 31, 2022                                         $ 609 $ 14 159,121 (141,998) 17,746
Net Loss                                         0 0 0 (2,155) (2,155)
Stock-based compensation expense related to employee and director stock awards                                         $ 0 $ 0 154 0 154
Conversion of Preferred Stock to common stock (in shares)                                         (1) 57      
Conversion of Preferred Stock to common stock                                         $ (39) $ 1 38 0 0
Vesting of director restricted stock awards (in shares)                                         0 3      
Conversion of Preferred Stock to common stock                                         $ 39 $ (1) (38) 0 0
Vesting of director restricted stock awards                                         0 0 0 0 0
Balance at Jun. 30, 2022                                         $ 570 $ 15 159,313 (144,153) 15,745
Balance (in shares)                                         12 1,529      
Balance (in shares) at Jun. 30, 2022                                         12 1,529      
Net Loss                                         $ 0 $ 0 0 (136) (136) [1]
Stock-based compensation expense related to employee and director stock awards                                         0 0 (208) 0 (208)
Modification of common stock warrants                                         $ 0 $ 0 1,922 0 1,922
Exercise of warrants, net of offering costs (in shares)                                         0 328      
Exercise of warrants, net of offering costs                                         $ 0 $ 3 283 0 286
Reclassification of common stock warrants to liability                                         0 0 (3,825) 0 (3,825)
Adjustment of Series B Preferred Stock conversion price                                         0 0 5,657 (5,657) 0
Balance at Sep. 30, 2022                                         $ 570 $ 18 163,142 (149,946) 13,784
Balance (in shares)                                         12 1,857      
Balance (in shares)                                         14 2,035      
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 (1,739) (1,739)
Stock-based compensation expense related to employee and director stock awards                                         0 0 75 0 75
Balance at Mar. 31, 2023                                         $ 2,973 $ 20 165,788 (159,891) 8,890
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                                                 (5,532)
Conversion of Preferred Stock to common stock         268         728                              
Conversion of Preferred Stock to common stock         (268)         (728)                              
Balance at Sep. 30, 2023                                         $ 1,977 $ 65 170,675 (165,680) 7,037
Balance (in shares)                                         14 2,035      
Balance (in shares) at Mar. 31, 2023                                         14 2,035      
Balance at Mar. 31, 2023                                         $ 2,973 $ 20 165,788 (159,891) 8,890
Net Loss                                         0 0 0 (2,036) (2,036)
Stock-based compensation expense related to employee and director stock awards                                         0 0 64 0 64
Conversion of Preferred Stock to common stock (in shares) (3) 1,897       (1) 277                                    
Conversion of Preferred Stock to common stock $ (121) $ 19 $ 102 $ 0 0 $ (728) $ 2 $ 726 $ 0 0                              
Modification of common stock warrants                                         0 0 285 0 285
Adjustment of Preferred Stock conversion price                     $ 0 $ 0 $ 1,802 $ (1,802) $ 0 $ 0 $ 0 $ 194 $ (194) $ 0          
Reclassification of May 2023 Warrants                                         $ 0 $ 0 1,360 0 1,360
Vesting of director restricted stock awards (in shares)                                         0 5      
Conversion of Preferred Stock to common stock $ 121 $ (19) $ (102) $ 0 $ 0 $ 728 $ (2) $ (726) $ 0 $ 0                              
Balance at Jun. 30, 2023                                         $ 2,124 $ 41 170,321 (163,923) 8,563
Balance (in shares)                                         10 4,214      
Balance (in shares) at Jun. 30, 2023                                         10 4,214      
Net Loss                                         $ 0 $ 0 0 (1,757) (1,757)
Stock-based compensation expense related to employee and director stock awards                                         $ 0 $ 0 62 0 62
Conversion of Preferred Stock to common stock (in shares)                                         (3) 2,315      
Conversion of Preferred Stock to common stock                                         $ (147) $ 24 123 0 0
Reclassification of derivative liability                                         0 0 169 0 169
Conversion of Preferred Stock to common stock                                         147 (24) (123) 0 0
Balance at Sep. 30, 2023                                         $ 1,977 $ 65 $ 170,675 $ (165,680) $ 7,037
Balance (in shares)                                         7 6,529      
[1] After giving retroactive effect to a 1-for-35 reverse stock split that became effective November 15, 2022.