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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, 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) $ 887   887
Net loss   (15,237) (15,237)
Balances, end of period at Dec. 31, 2021 $ 474,181 (459,887) 14,294
Balances, end of period (in shares) at Dec. 31, 2021 117,189,232    
Shares issued, net of offering costs (Note 6) $ 244   244
Shares issued, net of offering costs (Note 6) (in shares) 401,884    
Shares issued (RSUs vested, net of shares withheld) (Note 6) $ (357)   (357)
Shares issued (RSUs vested, net of shares withheld) (Note 6) (in shares) 889,762    
Stock-based compensation (Note 6) $ 779   779
Net loss   (4,931) (4,931)
Balances, end of period at Dec. 31, 2022 $ 474,847 $ (464,818) $ 10,029
Balances, end of period (in shares) at Dec. 31, 2022 118,480,878