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Share Based Payments - Summary of Stock Option Activity (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
CAD ($)
$ / shares
shares
Dec. 31, 2017
CAD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Stock Options, Beginning balance outstanding 2,448,646 2,448,646 1,969,000
Number of Stock Options, Granted 1,011,406 1,011,406 868,902
Number of Stock Options, Forfeited (53,503) (53,503) (153,067)
Number of Stock Options, Cancelled     (62,689)
Number of Stock Options, Exercised (98,500) (98,500) (173,500)
Number of Stock Options, Ending balance outstanding 3,308,049 3,308,049 2,448,646
Number of Stock Options, Exercisable 1,918,672    
Weighted Average Exercise Price, Beginning balance outstanding | $ / shares   $ 7.35 $ 6.00
Weighted Average Exercise Price, Granted | (per share) $ 10.12   11.15
Weighted Average Exercise Price, Forfeited | (per share) 9.89   11.45
Weighted Average Exercise Price, Cancelled | $ / shares     13.75
Weighted Average Exercise Price, Exercised | (per share) 3.10   5.15
Weighted Average Exercise Price, Ending balance outstanding | (per share) 7.14   $ 7.35
Weighted Average Exercise Price, Exercisable | $ / shares $ 3.18    
Aggregate Intrinsic Value, Beginning balance outstanding | $   $ 21,089 $ 8,218
Aggregate Intrinsic Value, Ending balance outstanding $ 8,308   $ 21,089
Aggregate Intrinsic Value, Exercisable | $ $ 7,616