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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, 2021 $ 474,181 $ (459,887) $ 14,294
Balances, beginning of period (in shares) at Dec. 31, 2021 117,189,232    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (327)   (327)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 791,868    
Stock-based compensation (Note 6) $ 444   444
Net loss   (320) (320)
Balances, end of period at Mar. 31, 2022 $ 474,298 (460,207) 14,091
Balances, end of period (in shares) at Mar. 31, 2022 117,981,100    
Balances, beginning of period at Dec. 31, 2022 $ 474,847 (464,818) 10,029
Balances, beginning of period (in shares) at Dec. 31, 2022 118,480,878    
Shares issued, net of offering costs (Note 6) $ 453   453
Shares issued, net of offering costs (Note 6) (in shares) 834,146    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (142)   (142)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 412,548    
Stock-based compensation (Note 6) $ 179   179
Net loss   (1,971) (1,971)
Balances, end of period at Mar. 31, 2023 $ 475,337 $ (466,789) $ 8,548
Balances, end of period (in shares) at Mar. 31, 2023 119,727,572