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Share Based Payments - Schedule of Stock Options and Weighted Average Exercise Prices (Details) | 12 Months Ended |
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Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares | Dec. 31, 2018 CAD ($) | Dec. 31, 2018
Disclosure Of Share-based Payment Arrangements [Abstract] |  |  |  |  |
Outstanding, beginning of the year (shares) | shares | 647,156 | 912,995 | 901,114 |  |
Granted during the year (shares) | shares | 750,467 | 42,625 | 165,460 |  |
Forfeited during the year (shares) | shares | (105,338) | (211,847) | (77,629) |  |
Expired during the year (shares) | shares | (1,122) | (12,302) | (75,950) |  |
Exercised during the year (shares) | shares | (41,802) | (84,315) | 0 |  |
Outstanding, end of the year (shares) | shares | 1,249,361 | 647,156 | 912,995 |  |
Options exercisable, end of the year (shares) | 777,245 | 573,984 | 689,883 |  | 777,245
Outstanding, beginning of the year (cad per share) | $ 13.20 | $ 17.42 | $ 20.58 |  |
Granted during the year (cad per share) | 4.97 | 4.60 | 2.67 |  |
Forfeited during the year (cad per share) | 11.67 | 32.80 | 6.18 |  |
Expired during the year (cad per share) | 13.78 | 21.13 | 34.27 |  |
Exercised during the year (cad per share) | 2.96 | 4.07 | 0.00 |  |
Outstanding, end of the year (cad per share) | $ 8.73 | 13.20 | 17.42 |  |
Options exercisable, end of the year (cad per share) |  | $ 14.36 | $ 22.03 | $ 11.04 |

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