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Common Shares - Summary Of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Shares      
Number of options, beginning of period (in shares) 1,437,000 1,319,149  
Granted, Number of options (in shares) 50,000 350,000  
Number of options, Exercised (in shares) (50,000) (163,667)  
Number of options, Cancelled/Forfeited (in shares) (70,000) (16,667)  
Number of options, Expired (in shares)   (51,815)  
Number of options, end of period (in shares) 1,367,000 1,437,000 1,319,149
Number of options, Exercisable (in shares) 1,333,667    
Weighted average exercise price per option, beginning of period (in dollars per share) $ 0.73 $ 0.71  
Weighted average exercise price per option, Granted (in dollars per share) 0.51 0.73  
Weighted average exercise price per option, Exercised (in dollars per share) 0.75 0.54  
Weighted average exercise price per option, Cancelled/Forfeited (in dollars per share) 1.02 0.75  
Weighted average exercise price per option, Expired (in dollars per share)   0.70  
Weighted average exercise price per option, end of period (in dollars per share) 0.71 $ 0.73 $ 0.71
Weighted average exercise price, Exercisable (in dollars per share) $ 0.71    
Weighted average remaining contractual term, Outstanding 2 years 7 months 17 days 3 years 5 months 26 days 3 years 10 months 2 days
Weighted average remaining contractual term, Exercisable 2 years 7 months 13 days    
Aggregate intrinsic value, Outstanding, beginning of period (in dollars) $ 35 $ 1  
Aggregate intrinsic value, Exercised (in dollars) 9 33  
Aggregate intrinsic value, Cancelled/Forfeited (in dollars) 0 0  
Aggregate intrinsic value, Expired (in dollars)   2  
Aggregate intrinsic value, Outstanding, end of period (in dollars) 507 $ 35 $ 1
Aggregate intrinsic value, Options, Exercisable $ 494