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Share-Based Compensation Plan - Summary of Share Options Outstanding (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
Dec. 31, 2016
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price 2,164,999 2,337,732 2,116,065
Stock option 1 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price 2,164,999 2,337,732  
Stock option 1 [member] | Exercise price in CA$ 0.7 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 0.70    
Exercise price   149,399  
Expiry date Expiry date - January 13, 2020    
Stock option 1 [member] | Exercise price in CA$ 1.24 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 1.24    
Exercise price 425,000 565,000  
Expiry date Expiry date - May 20, 2021    
Stock option 1 [member] | Exercise price in CA$ 1.27 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 1.27    
Exercise price 150,000 150,000  
Expiry date Expiry date - March 13, 2022    
Stock option 1 [member] | Exercise price in CA$ 0.85 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 0.85    
Exercise price 100,000 100,000  
Expiry date Expiry date - March 13, 2023    
Stock option 1 [member] | Exercise price in CA$ 1.1 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 1.10    
Exercise price 202,000 215,000  
Expiry date Expiry date - September 26, 2023    
Stock option 1 [member] | Exercise price in CA$ 1.48 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 1.48    
Exercise price 345,000 360,000  
Expiry date Expiry date - March 18, 2024    
Stock option 1 [member] | Exercise price in CA$ 0.94 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 0.94    
Exercise price 100,000 100,000  
Expiry date Expiry date - March 19, 2025    
Stock option 1 [member] | Exercise price in CA$ 0.83 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 0.83    
Exercise price 20,000 28,333  
Expiry date Expiry date - October 6, 2025    
Stock option 1 [member] | Exercise price in CA$ 0.8 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 0.80    
Exercise price 16,666 50,000  
Expiry date Expiry date - November 16, 2025    
Stock option 1 [member] | Exercise price in CA$ 1.43 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 1.43    
Exercise price 233,333 250,000  
Expiry date Expiry date - March 29, 2026    
Stock option 1 [member] | Exercise price in CA$ 1.55 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 1.55    
Exercise price 50,000 50,000  
Expiry date Expiry date - June 30, 2026    
Stock option 1 [member] | Exercise price in CA$ 2.2 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 2.20    
Exercise price 165,000 165,000  
Expiry date Expiry date - June 14, 2027    
Stock option 1 [member] | Exercise price in CA$ 6 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 6.00    
Exercise price 155,000 155,000  
Expiry date Expiry date - December 22, 2027    
Stock option 1 [member] | Exercise price in CA$ 5.79 [member]      
Disclosure of range of exercise prices of outstanding share options [line items]      
Exercise price $ 5.79    
Exercise price 203,000    
Expiry date Expiry date - June 5, 2028