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Share Capital - Disclosure of Range of Exercise Prices of Outstanding Share Options (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares $ / shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Number of options | shares | 2,675,113 | 2,776,302 | 2,635,747
Options Outstanding, Weighted average exercise price | $ 5.99 | $ 6.35 | $ 7.00
Options Exercisable, Number of options | shares | 2,140,771 |  |
$2.15 - $2.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Number of options | shares | 781,930 |  |
Options Outstanding, Weighted average exercise price | $ 2.52 |  |
Options Outstanding, Weighted average remaining contractual life (years) | 1 year 7 months 17 days |  |
Options Exercisable, Number of options | shares | 781,930 |  |
Options Exercisable, Weighted average exercise price | $ 2.52 |  |
$2.15 - $2.99 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | 2.15 |  |
$2.15 - $2.99 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | $ 2.99 |  |
$3.00 - $5.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Number of options | shares | 1,393,181 |  |
Options Outstanding, Weighted average exercise price | $ 5.26 |  |
Options Outstanding, Weighted average remaining contractual life (years) | 3 years 5 months 12 days |  |
Options Exercisable, Number of options | shares | 869,748 |  |
Options Exercisable, Weighted average exercise price | $ 3.26 |  |
$3.00 - $5.99 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | 3.00 |  |
$3.00 - $5.99 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | $ 5.99 |  |
$6.00 - $8.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Number of options | shares | 114,923 |  |
Options Outstanding, Weighted average exercise price | $ 6.79 |  |
Options Outstanding, Weighted average remaining contractual life (years) | 1 year 10 months 20 days |  |
Options Exercisable, Number of options | shares | 104,014 |  |
Options Exercisable, Weighted average exercise price | $ 6.17 |  |
$6.00 - $8.99 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | 6.00 |  |
$6.00 - $8.99 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | $ 8.99 |  |
$9.00 - $11.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Number of options | shares | 46,126 |  |
Options Outstanding, Weighted average exercise price | $ 11.62 |  |
Options Outstanding, Weighted average remaining contractual life (years) | 2 years 5 months 12 days |  |
Options Exercisable, Number of options | shares | 46,126 |  |
Options Exercisable, Weighted average exercise price | $ 11.62 |  |
$9.00 - $11.99 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | 9.00 |  |
$9.00 - $11.99 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | $ 11.99 |  |
$12.00 - $17.15 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Number of options | shares | 338,953 |  |
Options Outstanding, Weighted average exercise price | $ 15.94 |  |
Options Outstanding, Weighted average remaining contractual life (years) | 1 year 6 months 10 days |  |
Options Exercisable, Number of options | shares | 338,953 |  |
Options Exercisable, Weighted average exercise price | $ 15.94 |  |
$12.00 - $17.15 [Member] | Bottom of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | 12.00 |  |
$12.00 - $17.15 [Member] | Top of range [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Options Outstanding, Range of exercise price | $ 17.15 |  |

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