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Share Based Payments - Schedule of Stock Options and Weighted Average Exercise Prices (Details)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
shares
$ / shares
Disclosure Of Share-based Payment Arrangements [Abstract]      
Outstanding, beginning of the year (shares) | shares 1,249,361 647,156 912,995
Granted during the year (shares) | shares 1,020,000 750,467 42,625
Forfeited during the year (shares) | shares (12,839) (105,338) (211,847)
Expired during the year (shares) | shares (9,575) (1,122) (12,302)
Exercised during the year (shares) | shares 0 (41,802) (84,315)
Outstanding, end of the year (shares) | shares 2,246,947 1,249,361 647,156
Options exercisable, end of the year (shares) | shares 1,327,845 777,245 573,984
Outstanding, beginning of the year (cad per share) | $ / shares $ 8.73 $ 13.20 $ 17.42
Granted during the year (cad per share) | $ / shares 1.42 4.97 4.60
Forfeited during the year (cad per share) | $ / shares 11.35 11.67 32.80
Expired during the year (cad per share) | $ / shares 29.07 13.78 21.13
Exercised during the year (cad per share) | $ / shares 0.00 2.96 4.07
Outstanding, beginning of the year (cad per share) | $ / shares 5.31 8.73 13.20
Options exercisable, end of the year (cad per share) | $ / shares $ 7.22 $ 11.04 $ 14.36