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Summary of Status of Equity Incentive Plan (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 CAD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of options granted | shares | 13,752,016 | 13,752,016 |  |  |
Canadian Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 6,188,672 | 6,188,672 | 6,168,596 | 6,168,596 |
Number of options granted | shares | 377,100 | 377,100 | 615,200 | 615,200 |
Options Outstanding, Exercised | shares |  |  | (295,768) | (295,768) |
Options Outstanding, Forfeitures | shares | (1,665,412) | (1,665,412) | (299,356) | (299,356) |
Options Outstanding, Endiing balance | shares | 4,900,360 | 4,900,360 | 6,188,672 | 6,188,672 |
Weighted Average Exercise Price, Beginning balance | $ 8.70 |  | $ 8.93 |  |
Weighted Average Exercise Price, Granted | 7.30 |  | 4.46 |  |
Weighted Average Exercise Price, Exercised |  |  | 5.85 |  |
Weighted Average Exercise Price, Forfeitures | 8.98 |  | 7.57 |  |
Weighted Average Exercise Price, Ending balance | $ 8.50 |  | $ 8.70 |  |
Options exercisable | shares | 3,734,019 | 3,734,019 | 4,369,155 | 4,369,155 | 3,870,673
Canadian Share Options [Member] | Top of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance | $ 14.50 |  | $ 14.50 |  |
Range of Exercise Prices, Granted | 7.30 |  | 4.46 |  |
Range of Exercise Prices, Exercised |  |  | 5.85 |  |
Range of Exercise Prices, Forfeitures | 14.50 |  | 11.16 |  |
Range of Exercise Prices, Ending balance | 14.50 |  | 14.50 |  |
Canadian Share Options [Member] | Bottom of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance | 4.46 |  | 5.22 |  |
Range of Exercise Prices, Granted | 7.30 |  | 4.46 |  |
Range of Exercise Prices, Exercised |  |  | 5.22 |  |
Range of Exercise Prices, Forfeitures | 7.32 |  | 5.85 |  |
Range of Exercise Prices, Ending balance | $ 4.46 |  | $ 4.46 |  |
U.S. Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 5,337,070 | 5,337,070 | 4,582,237 | 4,582,237 |
Number of options granted | shares | 1,165,900 | 1,165,900 | 2,130,700 | 2,130,700 |
Options Outstanding, Exercised | shares |  |  | (31,000) | (31,000) |
Options Outstanding, Forfeitures | shares | (944,349) | (944,349) | (1,344,867) | (1,344,867) |
Options Outstanding, Endiing balance | shares | 5,558,621 | 5,558,621 | 5,337,070 | 5,337,070 |
Weighted Average Exercise Price, Beginning balance |  | $ 6.69 |  | $ 8.30 |
Weighted Average Exercise Price, Granted |  | 5.56 |  | 3.30 |
Weighted Average Exercise Price, Exercised |  |  |  | 4.95 |
Weighted Average Exercise Price, Forfeitures |  | 8.42 |  | 6.86 |
Weighted Average Exercise Price, Ending balance |  | $ 6.16 |  | $ 6.69 |
Options exercisable | shares | 2,891,808 | 2,891,808 | 2,626,326 | 2,626,326 | 2,468,185
U.S. Share Options [Member] | Top of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance |  | $ 15.21 |  | $ 15.21 |
Range of Exercise Prices, Granted |  | 5.57 |  | 5.02 |
Range of Exercise Prices, Exercised |  |  |  | 4.95 |
Range of Exercise Prices, Forfeitures |  | 10.96 |  | 10.74 |
Range of Exercise Prices, Ending balance |  | 15.21 |  | 15.21 |
U.S. Share Options [Member] | Bottom of Range [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Range of Exercise Prices, Beginning balance |  | 3.21 |  | 4.95 |
Range of Exercise Prices, Granted |  | 3.99 |  | 3.21 |
Range of Exercise Prices, Exercised |  |  |  | 4.95 |
Range of Exercise Prices, Forfeitures |  | 5.79 |  | 3.21 |
Range of Exercise Prices, Ending balance |  | $ 3.21 |  | $ 3.21 |

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