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Income Taxes - Significant Components of Temporary Differences, Unused Tax Credits and Unused Tax Losses (Detail) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Non-capital losses available for future periods [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Temporary Differences $ 31,030,000 $ 24,735,000
Expiry Date 2031 to 2037 2031 to 2037
Net capital losses [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Temporary Differences $ 355,000 $ 355,000
Expiry Date No expiry No expiry
Share issuance costs [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Temporary Differences $ 8,179,000 $ 12,148,000
Convertible debt [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Temporary Differences   24,211,000
Equipment [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Temporary Differences $ 424,000 $ 513,000