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Share-Based Compensation Plan - Summary of Stock Options Outstanding and Granted (Detail)
Dec. 31, 2018
CAD ($)
yr
Dec. 31, 2017
Dec. 31, 2016
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 2,164,999 2,337,732 2,116,065
Stock option 1 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 2,164,999 2,337,732  
Stock option 1 [member] | Exercise price in CA$ 1.24 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 425,000 565,000  
Remaining contractual life (years) | yr 2.4    
Number of exercisable options 425,000    
Exercise price | $ $ 1.24    
Stock option 1 [member] | Exercise price in CA$ 1.27 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 150,000 150,000  
Remaining contractual life (years) | yr 3.2    
Number of exercisable options 150,000    
Exercise price | $ $ 1.27    
Stock option 1 [member] | Exercise price in CA$ 0.85 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 100,000 100,000  
Remaining contractual life (years) | yr 4.2    
Number of exercisable options 100,000    
Exercise price | $ $ 0.85    
Stock option 1 [member] | Exercise price in CA$ 1.1 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 202,000 215,000  
Remaining contractual life (years) | yr 4.7    
Number of exercisable options 202,000    
Exercise price | $ $ 1.10    
Stock option 1 [member] | Exercise price in CA$ 1.48 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 345,000 360,000  
Remaining contractual life (years) | yr 5.2    
Number of exercisable options 345,000    
Exercise price | $ $ 1.48    
Stock option 1 [member] | Exercise price in CA$ 0.94 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 100,000 100,000  
Remaining contractual life (years) | yr 6.2    
Number of exercisable options 100,000    
Exercise price | $ $ 0.94    
Stock option 1 [member] | Exercise price in CA$ 0.83 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 20,000 28,333  
Remaining contractual life (years) | yr 6.8    
Number of exercisable options 20,000    
Exercise price | $ $ 0.83    
Stock option 1 [member] | Exercise price in CA$ 0.8 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 16,666 50,000  
Remaining contractual life (years) | yr 6.9    
Number of exercisable options 16,666    
Exercise price | $ $ 0.80    
Stock option 1 [member] | Exercise price in CA$ 1.43 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 233,333 250,000  
Remaining contractual life (years) | yr 7.3    
Number of exercisable options 150,002    
Exercise price | $ $ 1.43    
Stock option 1 [member] | Exercise price in CA$ 1.55 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 50,000 50,000  
Remaining contractual life (years) | yr 7.5    
Number of exercisable options 33,334    
Exercise price | $ $ 1.55    
Stock option 1 [member] | Exercise price in CA$ 2.2 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 165,000 165,000  
Remaining contractual life (years) | yr 8.5    
Number of exercisable options 54,999    
Exercise price | $ $ 2.20    
Stock option 1 [member] | Exercise price in CA$ 6 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 155,000 155,000  
Remaining contractual life (years) | yr 9.0    
Number of exercisable options 51,669    
Exercise price | $ $ 6.00    
Stock option 1 [member] | Exercise price in CA$ 5.79 [member]      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number outstanding 203,000    
Remaining contractual life (years) | yr 9.6    
Number of exercisable options    
Exercise price | $ $ 5.79