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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) $ 1,436   1,436
Shares issued, net of offering costs (Note 6) (in shares) 1,541,134    
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    
Stock-based compensation (Note 6) $ 757   757
Net income (loss)   2,622 2,622
Balances, end of period at Sep. 30, 2020 $ 459,822 (442,448) 17,374
Balances, end of period (in shares) at Sep. 30, 2020 102,684,704    
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 Jun. 30, 2020 $ 459,055 (446,668) 12,387
Balances, beginning of period (in shares) at Jun. 30, 2020 102,096,256    
Shares issued, net of offering costs (Note 6) $ 629   629
Shares issued, net of offering costs (Note 6) (in shares) 509,315    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (27)   (27)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 79,133    
Stock-based compensation (Note 6) $ 165   165
Net income (loss)   4,220 4,220
Balances, end of period at Sep. 30, 2020 $ 459,822 (442,448) 17,374
Balances, end of period (in shares) at Sep. 30, 2020 102,684,704    
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) $ 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) $ 727   727
Net income (loss)   (6,921) (6,921)
Balances, end of period at Sep. 30, 2021 $ 474,021 (451,571) 22,450
Balances, end of period (in shares) at Sep. 30, 2021 117,189,232    
Balances, beginning of period at Jun. 30, 2021 $ 461,560 (448,502) 13,058
Balances, beginning of period (in shares) at Jun. 30, 2021 104,909,837    
Shares issued, net of offering costs (Note 6) $ 12,323   12,323
Shares issued, net of offering costs (Note 6) (in shares) 12,272,730    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (5)   (5)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 6,665    
Stock-based compensation (Note 6) $ 143   143
Net income (loss)   (3,069) (3,069)
Balances, end of period at Sep. 30, 2021 $ 474,021 $ (451,571) $ 22,450
Balances, end of period (in shares) at Sep. 30, 2021 117,189,232