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Share-Based Compensation - Schedule of Stock Options and Weighted Average Exercise Prices (Details) | 12 Months Ended
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Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares
Stock Options |  |  |
Outstanding, beginning of the year (shares) | shares | 3,764,055 | 2,246,947 | 1,249,361
Granted during the year (shares) | shares | 1,832,500 | 1,817,500 | 1,020,000
Forfeited during the year (shares) | shares | (110,612) | (141,418) | (12,839)
Expired during the year (shares) | shares | (28,364) | (25,520) | (9,575)
Exercised during the year (shares) | shares | (123,159) | (133,454) | 0
Outstanding, end of the year (shares) | shares | 5,334,420 | 3,764,055 | 2,246,947
Options exercisable, end of the year (shares) | shares | 3,165,679 | 2,164,551 | 1,327,845
Weighted Average Exercise Price |  |  |
Outstanding, beginning of the year (cad per share) | $ / shares | $ 4.08 | $ 5.31 | $ 8.73
Granted during the year (cad per share) | $ / shares | 2.99 | 3.19 | 1.42
Forfeited during the year (cad per share) | $ / shares | 6.21 | 3.84 | 11.35
Expired during the year (cad per share) | $ / shares | 37.63 | 62.49 | 29.07
Exercised during the year (cad per share) | $ / shares | 1.94 | 1.81 | 0
Outstanding, beginning of the year (cad per share) | $ / shares | 3.53 | 4.08 | 5.31
Options exercisable, end of the year (cad per share) | $ / shares | $ 3.82 | $ 4.84 | $ 7.22

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