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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, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares | Dec. 31, 2015 CAD ($) shares | Dec. 31, 2017 CAD ($) | Dec. 31, 2017
Disclosure Of Share-based Payment Arrangements [Abstract] |  |  |  |  |
Outstanding, beginning of the year (shares) | shares | 8,674,227 | 8,561,394 | 5,446,394 |  |
Granted during the year (shares) | shares | 405,000 | 1,572,000 | 3,280,000 |  |
Forfeited during the year (shares) | shares | (2,012,660) | (737,500) | (100,000) |  |
Expired during the year (shares) | shares | (116,900) | (721,667) | (65,000) |  |
Exercised during the year (shares) | shares | (801,000) | 0 | 0 |  |
Outstanding, end of the year (shares) | shares | 6,148,667 | 8,674,227 | 8,561,394 |  |
Options exercisable, end of the year (shares) | 5,453,501 | 6,729,643 | 6,476,394 |  | 5,453,501
Outstanding, beginning of the year (cad per share) | $ 1.83 | $ 2.17 | $ 3.19 |  |
Granted during the year (cad per share) | 0.48 | 0.28 | 0.43 |  |
Forfeited during the year (cad per share) | 3.45 | 0.65 | 1.69 |  |
Expired during the year (cad per share) | 2.22 | 3.61 | 1.49 |  |
Exercised during the year (cad per share) | 0.43 | 0.00 | 0 |  |
Outstanding, end of the year (cad per share) | $ 1.39 | 1.83 | 2.17 |  |
Options exercisable, end of the year (cad per share) |  | $ 2.27 | $ 2.73 | $ 1.51 |

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