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Summary of Status of Equity Incentive Plan (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 CAD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 CAD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Weighted Average Exercise Price, Forfeitures | $ 10.58 |  | $ 8.98 |  |
Canadian Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 4,900,360 | 4,900,360 | 6,188,672 | 6,188,672 |
Options Outstanding, Granted | shares | 490,200 | 490,200 | 377,100 | 377,100 |
Options Outstanding, Forfeited | shares | (657,404) | (657,404) | (1,665,412) | (1,665,412) |
Options Outstanding, Endiing balance | shares | 4,733,156 | 4,733,156 | 4,900,360 | 4,900,360 |
Weighted Average Exercise Price, Beginning balance | $ 8.50 |  | $ 8.70 |  |
Weighted Average Exercise Price, Granted | 4.35 |  | 7.30 |  |
Weighted Average Exercise Price, Ending balance | $ 7.78 |  | $ 8.50 |  |
Options exercisable | shares | 3,786,473 | 3,786,473 | 3,734,019 | 3,734,019 | 4,369,155
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 | $ 4.46 |  | $ 4.46 |  |
Range of Exercise Prices, Granted | 4.35 |  | 7.30 |  |
Range of Exercise Prices, Forfeitures | 10.44 |  | 7.32 |  |
Range of Exercise Prices, Ending balance | 4.35 |  | 4.46 |  |
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 | 14.50 |  | 14.50 |  |
Range of Exercise Prices, Granted | 4.35 |  | 7.30 |  |
Range of Exercise Prices, Forfeitures | 14.50 |  | 14.50 |  |
Range of Exercise Prices, Ending balance | $ 14.31 |  | $ 14.50 |  |
U.S. Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 5,558,621 | 5,558,621 | 5,337,070 | 5,337,070 |
Options Outstanding, Granted | shares | 1,569,250 | 1,569,250 | 1,165,900 | 1,165,900 |
Options Outstanding, Forfeited | shares | (996,021) | (996,021) | (944,349) | (944,349) |
Options Outstanding, Endiing balance | shares | 6,065,850 | 6,065,850 | 5,558,621 | 5,558,621 |
Weighted Average Exercise Price, Beginning balance |  | $ 6.16 |  | $ 6.69 |
Weighted Average Exercise Price, Granted |  | 3.45 |  | 5.56 |
Weighted Average Exercise Price, Forfeitures |  | 8.08 |  | 8.42 |
Weighted Average Exercise Price, Ending balance |  | 5.17 |  | $ 6.16 |
Weighted Average Exercise Price, Exercised |  | $ 3.21 |  |  |
Options exercisable | shares | 3,224,078 | 3,224,078 | 2,891,808 | 2,891,808 | 2,626,326
Options Outstanding, Exercised | shares | (66,000) | (66,000) |  |  |
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 |  | $ 3.21 |  | $ 3.21 |
Range of Exercise Prices, Granted |  | 3.44 |  | 3.99 |
Range of Exercise Prices, Exercised |  | 3.21 |  |  |
Range of Exercise Prices, Forfeitures |  | 3.21 |  | 5.79 |
Range of Exercise Prices, Ending balance |  | 3.21 |  | 3.21 |
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 |  | 15.21 |  | 15.21 |
Range of Exercise Prices, Granted |  | 3.62 |  | 5.57 |
Range of Exercise Prices, Exercised |  | 3.21 |  |  |
Range of Exercise Prices, Forfeitures |  | 15.21 |  | 10.96 |
Range of Exercise Prices, Ending balance |  | $ 10.74 |  | $ 15.21 |

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