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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    
Stock-based compensation (Note 6) $ 390   390
Net loss   (3,500) (3,500)
Balances, end of period at Mar. 31, 2020 $ 458,106 (448,570) 9,536
Balances, end of period (in shares) at Mar. 31, 2020 100,698,124    
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) $ 434   434
Shares issued, net of offering costs (Note 6) (in shares) 405,800    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (194)   (194)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 421,219    
Stock-based compensation (Note 6) $ 421   421
Net loss   (3,099) (3,099)
Balances, end of period at Mar. 31, 2021 $ 461,162 $ (447,749) $ 13,413
Balances, end of period (in shares) at Mar. 31, 2021 103,998,923