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v3.20.1

Summary of Status of Equity Incentive Plan (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2018 shares $ / shares | Dec. 31, 2017 shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Weighted Average Exercise Price, Forfeitures | $ 10.51 |  | $ 10.58 |  |
Canadian Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 4,733,156 | 4,733,156 | 4,900,360 | 4,900,360 |
Options Outstanding, Granted | shares |  |  | 490,200 | 490,200 |
Options Outstanding, Forfeited | shares | (711,572) | (711,572) | (657,404) | (657,404) |
Options Outstanding, Ending balance | shares | 4,021,584 | 4,021,584 | 4,733,156 | 4,733,156 |
Weighted Average Exercise Price, Beginning balance | $ 7.78 |  | $ 8.50 |  |
Weighted Average Exercise Price, Granted |  |  | 4.35 |  |
Weighted Average Exercise Price, Ending balance | $ 7.29 |  | $ 7.78 |  |
Options exercisable | shares | 3,569,069 | 3,569,069 | 3,786,473 | 3,786,473 | 3,734,019
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 | $ 14.31 |  | $ 14.50 |  |
Range of Exercise Prices, Granted |  |  | 4.35 |  |
Range of Exercise Prices, Forfeitures | 10.67 |  | 14.50 |  |
Range of Exercise Prices, Ending balance | 14.31 |  | 14.31 |  |
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 | 4.35 |  | 4.46 |  |
Range of Exercise Prices, Granted |  |  | 4.35 |  |
Range of Exercise Prices, Forfeitures | 7.15 |  | 10.44 |  |
Range of Exercise Prices, Ending balance | $ 4.35 |  | $ 4.35 |  |
U.S. Share Options [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Options Outstanding, Beginning balance | shares | 6,065,850 | 6,065,850 | 5,558,621 | 5,558,621 |
Options Outstanding, Granted | shares | 599,300 | 599,300 | 1,569,250 | 1,569,250 |
Options Outstanding, Exercised | shares | 0 | 0 | (66,000) | (66,000) |
Options Outstanding, Forfeited | shares | (302,100) | (302,100) | (996,021) | (996,021) |
Options Outstanding, Ending balance | shares | 6,363,050 | 6,363,050 | 6,065,850 | 6,065,850 |
Weighted Average Exercise Price, Beginning balance |  | $ 5.17 |  | $ 6.16 |
Weighted Average Exercise Price, Granted |  | 2.56 |  | 3.45 |
Exercise Price Of Exercised Share Options |  |  |  | 3.21 |
Weighted Average Exercise Price, Forfeitures |  | 10.68 |  | 8.08 |
Weighted Average Exercise Price, Ending balance |  | $ 4.67 |  | $ 5.17 |
Options exercisable | shares | 4,348,824 | 4,348,824 | 3,224,078 | 3,224,078 | 2,891,808
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 |  | $ 10.74 |  | $ 15.21 |
Range of Exercise Prices, Granted |  | 2.56 |  | 3.62 |
Range of Exercise Prices, Exercised |  |  |  | 3.21 |
Range of Exercise Prices, Forfeitures |  | 10.74 |  | 15.21 |
Range of Exercise Prices, Ending balance |  | 9.18 |  | 10.74 |
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 |  | 3.21 |
Range of Exercise Prices, Granted |  | 2.56 |  | 3.44 |
Range of Exercise Prices, Exercised |  |  |  | 3.21 |
Range of Exercise Prices, Forfeitures |  | 7.79 |  | 3.21 |
Range of Exercise Prices, Ending balance |  | $ 2.56 |  | $ 3.21 |

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