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Disclosure of number and weighted average exercise prices of share options (Details) | 12 Months Ended
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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 |  |

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