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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
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