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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Accumulated Deficit [Member]
Total
Balances, beginning of period at Dec. 31, 2019 $ 457,716 $ (445,070) $ 12,646
Balances, beginning of period (in shares) at Dec. 31, 2019 100,698,124    
Shares issued, net of offering costs (Note 6) $ 1,959   1,959
Shares issued, net of offering costs (Note 6) (in shares) 2,028,334    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (124)   (124)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 395,446    
Shares issued (exercise of stock options) $ 37   $ 37
Shares issued (exercise of stock options) (in shares) 50,000   50,000
Stock-based compensation (Note 6) $ 913   $ 913
Net income (loss)   420 420
Balances, end of period at Dec. 31, 2020 $ 460,501 (444,650) 15,851
Balances, end of period (in shares) at Dec. 31, 2020 103,171,904    
Shares issued, net of offering costs (Note 6) $ 13,194   13,194
Shares issued, net of offering costs (Note 6) (in shares) 13,071,000    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (401)   (401)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 946,328    
Stock-based compensation (Note 6) $ 887   887
Net income (loss)   (15,237) (15,237)
Balances, end of period at Dec. 31, 2021 $ 474,181 $ (459,887) $ 14,294
Balances, end of period (in shares) at Dec. 31, 2021 117,189,232