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Stock-based compensation, Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Nov. 21, 2019
Dec. 31, 2020
Dec. 31, 2019
Weighted Average Grant Date Fair Value [Abstract]      
Stock-based compensation expense   $ 1,633 $ 1,195
Unrecognized compensation expense   $ 1,715  
Weighted average period of recognition   1 year 18 days  
Restricted Stock Units [Member]      
Restricted Stock Units [Abstract]      
Unvested balance at beginning of period (in shares)   77,237 70,049
Granted (in shares)   0 77,237
Vested/settled (in shares)   (68,091) (60,387)
Forfeited/expired (in shares)   (9,146) (9,662)
Unvested balance at end of period (in shares)   0 77,237
Weighted Average Grant Date Fair Value [Abstract]      
Unvested balance at beginning of period (in dollars per share)   $ 2.46 $ 2.07
Granted (in dollars per share)   0 2.46
Vested/settled (in dollars per share)   2.46 2.07
Forfeited/expired (in dollars per share)   2.46 2.07
Unvested balance at end of period (in dollars per share)   $ 0 $ 2.46
Number of shares vested but not issued (in shares)   88,194 91,787
Restricted Stock Units [Member] | Members of the Board of Directors [Member]      
Restricted Stock Units [Abstract]      
Aggregate grant date fair value $ 190 $ 290  
Term of vesting 12 months 12 months  
Granted (in shares) 77,237 140,097  
Weighted Average Grant Date Fair Value [Abstract]      
Granted (in dollars per share) $ 2.46 $ 2.07