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Common Shares - Summary Of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Common Shares      
Number of options, beginning of period (in shares) 1,144,500 1,544,500  
Number of options, Expired (in shares)   (400,000)  
Granted, Number of options (in shares) 1,142,000 0  
Number of options, Exercised (in shares) (218,600)    
Number of options, Cancelled/Forfeited (in shares) (748,751)    
Number of options, end of period (in shares) 1,319,149 1,144,500 1,544,500
Number of options, Exercisable (in shares) 559,480    
Weighted average exercise price per option, beginning of period (in dollars per share) $ 0.42 $ 1.05  
Weighted average exercise price per option, Expired (in dollars per share)   2.87  
Weighted average exercise price per option, Granted (in dollars per share) 0.71    
Weighted average exercise price per option, Exercised (in dollars per share) 0.39    
Weighted average exercise price per option, Cancelled/Forfeited (in dollars per share) 0.36    
Weighted average exercise price per option, end of period (in dollars per share) 0.71 $ 0.42 $ 1.05
Weighted average exercise price, Exercisable (in dollars per share) $ 0.70    
Weighted average remaining contractual term, Outstanding 3 years 10 months 2 days 1 year 1 month 24 days 1 year 9 months 15 days
Weighted average remaining contractual term, Exercisable 3 years 2 months 23 days    
Aggregate intrinsic value, Outstanding, beginning of period (in dollars) $ 346 $ 626  
Aggregate intrinsic value, Exercised (in dollars) 36    
Aggregate intrinsic value, Outstanding, end of period (in dollars) 1 $ 346 $ 626
Aggregate intrinsic value, Options, Exercisable $ 1