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Disclosure of number and weighted average exercise prices of share options (Details)
 12 Months Ended
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2015
CAD ($)
Statement [Line Items]      
Number of share options outstanding in share-based payment arrangement at beginning of period 4,811,500 5,428,500 5,493,200
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period $ 1.24 $ 1.67 $ 2.03
Number of share options granted in share-based payment arrangement 1,472,500 1,277,500 1,341,500
Weighted average exercise price of share options granted in share-based payment arrangement $ 1.20 $ 1.30 $ 0.66
Number of share options exercised in share-based payment arrangement (75,000) (165,000)  
Weighted average exercise price of share options exercised in share-based payment arrangement $ 1.14 $ 0.77  
Number of share options expired in share-based payment arrangement (961,500) (1,729,500) (1,406,200)
Weighted average exercise price of share options expired in share-based payment arrangement $ 1.97 $ 2.66 $ 2.12
Number of share options outstanding in share-based payment arrangement at end of period 5,247,500 4,811,500 5,428,500
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period $ 1.10 $ 1.24 $ 1.67
Number of share options exercisable in share-based payment arrangement 5,235,000    
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 1.10