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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, 2018 $ 456,938 $ (435,684) $ 21,254
Balances, beginning of period (in shares) at Dec. 31, 2018 100,268,161    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (76)   (76)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 266,296    
Shares issued (exercise of stock options) $ 89   $ 89
Shares issued (exercise of stock options) (in shares) 163,667   163,667
Stock-based compensation (Note 6) $ 765   $ 765
Net income/(loss)   (9,386) (9,386)
Balances, end of period at Dec. 31, 2019 $ 457,716 (445,070) 12,646
Balances, end 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