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Common Shares - Summary Of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Common Shares        
Number of options, beginning of period (in shares) 1,319,149 1,144,500 1,144,500  
Granted, Number of options (in shares)   0 1,142,000  
Number of options, Exercised (in shares) (127,000)   (218,600)  
Number of options, Cancelled/Forfeited (in shares) (149)   (748,751)  
Number of options, end of period (in shares) 1,192,000   1,319,149 1,144,500
Number of options, Exercisable (in shares) 718,997      
Weighted average exercise price per option, beginning of period (in dollars per share) $ 0.71 $ 0.42 $ 0.42  
Weighted average exercise price per option, Granted (in dollars per share)     0.71  
Weighted average exercise price per option, Exercised (in dollars per share) 0.52   0.39  
Weighted average exercise price per option, Cancelled/Forfeited (in dollars per share) 0.52   0.36  
Weighted average exercise price per option, end of period (in dollars per share) 0.73   $ 0.71 $ 0.42
Weighted average exercise price, Exercisable (in dollars per share) $ 0.75      
Weighted average remaining contractual term, Outstanding 3 years 11 months 23 days   3 years 10 months 2 days 1 year 1 month 24 days
Weighted average remaining contractual term, Exercisable 3 years 10 months 21 days      
Aggregate intrinsic value, Outstanding, beginning of period (in dollars) $ 1 $ 346 $ 346  
Aggregate intrinsic value, Exercised (in dollars) 29   36  
Aggregate intrinsic value, Outstanding, end of period (in dollars) 22   $ 1 $ 346
Aggregate intrinsic value, Options, Exercisable $ 8