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UNAUDITED CONDENSED 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) $ 807   807
Shares issued, net of offering costs (Note 6) (in shares) 1,031,819    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (97)   (97)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 316,313    
Shares issued (exercise of stock options) $ 37   37
Shares issued (exercise of stock options) (in shares) 50,000    
Stock-based compensation (Note 6) $ 592   592
Net income (loss)   (1,598) (1,598)
Balances, end of period at Jun. 30, 2020 $ 459,055 (446,668) 12,387
Balances, end of period (in shares) at Jun. 30, 2020 102,096,256    
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 (exercise of stock options) (in shares)     50,000
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    
Balances, beginning of period at Mar. 31, 2020 $ 458,106 (448,570) 9,536
Balances, beginning of period (in shares) at Mar. 31, 2020 100,698,124    
Shares issued, net of offering costs (Note 6) $ 807   807
Shares issued, net of offering costs (Note 6) (in shares) 1,031,819    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (97)   (97)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 316,313    
Shares issued (exercise of stock options) $ 37   37
Shares issued (exercise of stock options) (in shares) 50,000    
Stock-based compensation (Note 6) $ 202   202
Net income (loss)   1,902 1,902
Balances, end of period at Jun. 30, 2020 $ 459,055 (446,668) 12,387
Balances, end of period (in shares) at Jun. 30, 2020 102,096,256    
Balances, beginning of period at Dec. 31, 2020 $ 460,501 (444,650) 15,851
Balances, beginning of period (in shares) at Dec. 31, 2020 103,171,904    
Shares issued, net of offering costs (Note 6) $ 871   871
Shares issued, net of offering costs (Note 6) (in shares) 798,270    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (396)   (396)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 939,663    
Stock-based compensation (Note 6) $ 584   584
Net income (loss)   (3,852) (3,852)
Balances, end of period at Jun. 30, 2021 $ 461,560 (448,502) 13,058
Balances, end of period (in shares) at Jun. 30, 2021 104,909,837    
Balances, beginning of period at Mar. 31, 2021 $ 461,162 (447,749) 13,413
Balances, beginning of period (in shares) at Mar. 31, 2021 103,998,923    
Shares issued, net of offering costs (Note 6) $ 437   437
Shares issued, net of offering costs (Note 6) (in shares) 392,470    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (202)   (202)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 518,444    
Stock-based compensation (Note 6) $ 163   163
Net income (loss)   (753) (753)
Balances, end of period at Jun. 30, 2021 $ 461,560 $ (448,502) $ 13,058
Balances, end of period (in shares) at Jun. 30, 2021 104,909,837