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Share Capital - Summary of Non-Vested Options (Detail) | 12 Months Ended
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Dec. 31, 2017 CAD Options | Dec. 31, 2016 CAD Options
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share options, beginning of the year | Options | 3,655,020 |
Number of share subject to options, Granted | 1,229,689 | 995,904
Share options, end of the year | Options | 4,426,237 | 3,655,020
Weighted average grant date fair value, Granted | CAD 5.03 | CAD 5.22
Non-vested options [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share options, beginning of the year | 1,826,629 |
Number of share subject to options, Granted | 1,229,689 |
Number of share subject to options, Vested | (852,874) |
Number of share subject to options, Forfeited | (64,124) |
Share options, end of the year | 2,139,320 | 1,826,629
Weighted average grant date fair value, Granted | CAD 5.03 |
Weighted average grant date fair value, Vested | 5.98 |
Weighted average grant date fair value, Forfeited | 5.46 |
Weighted average grant date fair value, Non-vested share options | CAD 5.28 | CAD 5.78

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