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Share Capital and Reserves - Summary of Stock Option Transactions and the Number of Stock Options (Detail) | 1 Months Ended | 12 Months Ended
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May 31, 2017 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of terms and conditions of share-based payment arrangement [abstract] |  |  |
Number of Stock Options Outstanding, Beginning Balance |  | 37,858,334 | 33,466,112
Number of Stock Options, Granted |  | 9,045,482 | 6,200,000
Number of Stock Options, Exercised |  | (10,458,334) | (1,424,445)
Number of Stock Options, Forfeited |  | (208,334) | (383,333)
Number of Stock Options Outstanding, Ending Balance |  | 36,237,148 | 37,858,334
Number of Stock Options Outstanding, Number of options exercisable |  | 28,373,492 |
Weighted Average Exercise Price Outstanding, Beginning Balance |  | $ 1.42 | $ 1.06
Weighted Average Exercise Price, Granted |  | 2.64 | 3.27
Weighted Average Exercise Price, Exercised | $ 0.50 | 0.49 | 0.79
Weighted Average Exercise Price, Forfeited |  | 3.23 | 2.53
Weighted Average Exercise Price Outstanding, Ending Balance |  | 1.98 | $ 1.42
Weighted Average Exercise Price Outstanding, Number of options exercisable |  | $ 1.76 |

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