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Range of Exercise Prices for Options Outstanding (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares $ / shares | Dec. 31, 2017 shares $ / shares
Canadian Share Options [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares | 4,021,584 | 4,733,156 | 4,021,584 | 4,733,156 | 4,900,360 | 4,900,360
Total options outstanding, Weighted average exercise price | $ / shares | $ 7.29 | $ 7.78 |  |  | $ 8.50 |
Options exercisable, Number | shares | 3,569,069 | 3,786,473 | 3,569,069 | 3,786,473 | 3,734,019 | 3,734,019
Canadian Share Options [Member] | 4.46 - 7.99 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares | 1,105,400 |  | 1,105,400 |  |  |
Total options outstanding, Weighted average exercise price | $ / shares | $ 4.41 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 4 years 14 days |  |  |  |  |
Options exercisable, Number | shares | 778,595 |  | 778,595 |  |  |
Options exercisable, Weighted average exercise price | $ / shares | $ 4.44 |  |  |  |  |
Canadian Share Options [Member] | 8.00 - 9.99 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares | 1,533,334 |  | 1,533,334 |  |  |
Total options outstanding, Weighted average exercise price | $ / shares | $ 7.32 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 2 years 7 months 2 days |  |  |  |  |
Options exercisable, Number | shares | 1,407,624 |  | 1,407,624 |  |  |
Options exercisable, Weighted average exercise price | $ / shares | $ 7.32 |  |  |  |  |
Canadian Share Options [Member] | 10.00 - 14.50 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares | 1,382,850 |  | 1,382,850 |  |  |
Total options outstanding, Weighted average exercise price | $ / shares | $ 9.57 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 6 months 21 days |  |  |  |  |
Options exercisable, Number | shares | 1,382,850 |  | 1,382,850 |  |  |
Options exercisable, Weighted average exercise price | $ / shares | $ 9.57 |  |  |  |  |
Canadian Share Options [Member] | 4.46 - 14.50 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares | 4,021,584 |  | 4,021,584 |  |  |
Total options outstanding, Weighted average exercise price | $ / shares | $ 7.29 |  |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) | 2 years 3 months 14 days |  |  |  |  |
Options exercisable, Number | shares | 3,569,069 |  | 3,569,069 |  |  |
Options exercisable, Weighted average exercise price | $ / shares | $ 7.56 |  |  |  |  |
U.S. Share Options [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares | 6,363,050 | 6,065,850 | 6,363,050 | 6,065,850 | 5,558,621 | 5,558,621
Total options outstanding, Weighted average exercise price | $ / shares |  |  | $ 4.67 | $ 5.17 |  | $ 6.16
Options exercisable, Number | shares | 4,348,824 | 3,224,078 | 4,348,824 | 3,224,078 | 2,891,808 | 2,891,808
U.S. Share Options [Member] | Top of Range [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Range of exercise prices | $ / shares |  | $ 3.21 |  |  |  |
U.S. Share Options [Member] | Bottom Of Range [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Range of exercise prices | $ / shares |  | $ 3.21 |  |  |  |
U.S. Share Options [Member] | 3.21 - 4.99 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares |  | 3,646,250 |  | 3,646,250 |  |
Total options outstanding, Weighted average exercise price | $ / shares |  | $ 3.21 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) |  | 4 years 6 months |  |  |  |
Options exercisable, Number | shares |  | 2,011,540 |  | 2,011,540 |  |
Options exercisable, Weighted average exercise price | $ / shares |  | $ 3.27 |  |  |  |
U.S. Share Options [Member] | 5.00 - 7.99 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares |  | 1,924,500 |  | 1,924,500 |  |
Total options outstanding, Weighted average exercise price | $ / shares |  | $ 5.61 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) |  | 3 years 4 months 13 days |  |  |  |
Options exercisable, Number | shares |  | 1,544,984 |  | 1,544,984 |  |
Options exercisable, Weighted average exercise price | $ / shares |  | $ 5.62 |  |  |  |
U.S. Share Options [Member] | 8.00 - 15.21 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares |  | 792,300 |  | 792,300 |  |
Total options outstanding, Weighted average exercise price | $ / shares |  | $ 9.08 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) |  | 7 months 6 days |  |  |  |
Options exercisable, Number | shares |  | 792,300 |  | 792,300 |  |
Options exercisable, Weighted average exercise price | $ / shares |  | $ 9.08 |  |  |  |
U.S. Share Options [Member] | 3.21 - 15.21 Range of Exercise Prices [Member] |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |
Total options outstanding, Number | shares |  | 6,363,050 |  | 6,363,050 |  |
Total options outstanding, Weighted average exercise price | $ / shares |  | $ 4.67 |  |  |  |
Total options outstanding, Weighted average remaining contractual life (years) |  | 3 years 8 months 1 day |  |  |  |
Options exercisable, Number | shares |  | 4,348,824 |  | 4,348,824 |  |
Options exercisable, Weighted average exercise price | $ / shares |  | $ 5.17 |  |  |  |

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