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Disclosure of range of exercise prices of outstanding share options (Details) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Statement [Line Items] |  |  |  |
Number of share options outstanding in share-based payment arrangement | 5,247,500 | 4,811,500 | 5,428,500 | 5,493,200
Number of share options exercisable in share-based payment arrangement | 5,235,000 |  |  |
Granted April 25, 2014 [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,290,500 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,290,500 |  |  |
Exercise price of outstanding share options | $ 1.20 |  |  |
Granted June 26, 2014 [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Number of share options outstanding in share-based payment arrangement | 17,500 |  |  |
Number of share options exercisable in share-based payment arrangement | 17,500 |  |  |
Exercise price of outstanding share options | $ 0.88 |  |  |
Granted December 22, 2014 [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Number of share options outstanding in share-based payment arrangement | 60,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 60,000 |  |  |
Exercise price of outstanding share options | $ 0.87 |  |  |
Granted June 8, 2015 [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,167,500 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,167,500 |  |  |
Exercise price of outstanding share options | $ 0.66 |  |  |
Granted October 18, 2016 [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,239,500 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,239,500 |  |  |
Exercise price of outstanding share options | $ 1.30 |  |  |
Granted August 28, 2017 [Member] |  |  |  |
Statement [Line Items] |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,472,500 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,460,000 |  |  |
Exercise price of outstanding share options | $ 1.20 |  |  |

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