Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Total
Balance at Dec. 31, 2019   $ 50 $ 258,767 $ (240,610) $ (500) $ 17,707
Balance, shares at Dec. 31, 2019 5,659 50,250,378        
Exercise of common stock warrants   $ 5 35     $ 40
Exercise of common stock warrants, shares   5,364,997       5,364,997
Public offering of common shares, net of offering costs   $ 14 9,769     $ 9,783
Public offering of common shares, net of offering costs, shares   13,275,444        
Stock based compensation     158     158
Net loss       (11,448)   (11,448)
Balance at Dec. 31, 2020   $ 69 268,729 (252,058) (500) 16,240
Balance, shares at Dec. 31, 2020 5,659 68,890,819        
Exercise of common stock warrants   $ 3 5,649     $ 5,652
Exercise of common stock warrants, shares   3,343,660       3,343,660
Exercise of options     725     $ 725
Exercise of options, shares   446,551       446,551
Vesting of RSUs, shares   16,667        
Public offering of common shares, net of offering costs     183     $ 183
Public offering of common shares, net of offering costs, shares   233,793        
Stock based compensation     650     650
Net loss       (5,206)   (5,206)
Balance at Dec. 31, 2021   $ 72 $ 275,936 $ (257,264) $ (500) $ 18,244
Balance, shares at Dec. 31, 2021 5,659 72,931,490