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Related Party Transactions - Disclosure of Information About Key Management Personnel (Parenthetical) (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]    
Key management personnel compensation, short-term employee benefits $ 3,961,649 $ 4,101,441
Key management personnel compensation, share-based payment 12,377,331 8,830,606
Salaries, Employees Benefits and Directors Fee [member]    
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]    
Key management personnel compensation, short-term employee benefits 3,320,106 3,164,827
Key management personnel compensation, share-based payment 11,534,811 7,696,538
Capitalized to Exploration and Evaluation Assets [member]    
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items]    
Key management personnel compensation, short-term employee benefits 641,543 936,614
Key management personnel compensation, share-based payment $ 842,520 $ 1,134,068