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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, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Disclosure Of Share-based Payment Arrangements [Abstract] |  |  |
Outstanding, beginning of the year (shares) | shares | 2,246,947 | 1,249,361 | 647,156
Granted during the year (shares) | shares | 1,817,500 | 1,020,000 | 750,467
Forfeited during the year (shares) | shares | (141,418) | (12,839) | (105,338)
Expired during the year (shares) | shares | (25,520) | (9,575) | (1,122)
Exercised during the year (shares) | shares | (133,454) | 0 | (41,802)
Outstanding, end of the year (shares) | shares | 3,764,055 | 2,246,947 | 1,249,361
Options exercisable, end of the year (shares) | shares | 2,164,551 | 1,327,845 | 777,245
Outstanding, beginning of the year (cad per share) | $ / shares | $ 5.31 | $ 8.73 | $ 13.20
Granted during the year (cad per share) | $ / shares | 3.19 | 1.42 | 4.97
Forfeited during the year (cad per share) | $ / shares | 3.84 | 11.35 | 11.67
Expired during the year (cad per share) | $ / shares | 62.49 | 29.07 | 13.78
Exercised during the year (cad per share) | $ / shares | 1.81 | 0 | 2.96
Outstanding, beginning of the year (cad per share) | $ / shares | 4.08 | 5.31 | 8.73
Options exercisable, end of the year (cad per share) | $ / shares | $ 4.84 | $ 7.22 | $ 11.04

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