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Financial Instruments - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about financial instruments [line items]        
Cash and cash equivalents $ 125,059,189   $ 164,943,850 $ 31,090,313
Accounts payable and accrued liabilities $ 5,966,921   $ 2,905,179  
Convertible debentures, aggregate principal amount   $ 120,000,000    
Borrowings, interest rate 7.50% 7.50% 7.50%  
Amounts held in foreign risk [member]        
Disclosure of detailed information about financial instruments [line items]        
Financial liabilities, net   $ 75,988,648    
Percentage of reasonably possible change in currency rates 10.00%      
Value at risk $ 10,366,195