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Disclosure of number and weighted average exercise prices of share options (Details) |  | 12 Months Ended
--- | --- | ---
Sep. 12, 2016 | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Statement [Line Items] |  |  |
Number of share options outstanding in share-based payment arrangement at beginning of period |  | 5,971,668 | 6,217,334
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period |  | $ 0.79 | $ 1.24
Number of share options granted in share-based payment arrangement | 1,550,000 |  | 1,550,000
Weighted average exercise price of share options granted in share-based payment arrangement |  |  | $ 0.96
Number of share options exercised in share-based payment arrangement |  | (1,688,333) | (270,666)
Weighted average exercise price of share options exercised in share-based payment arrangement |  | $ 0.85 | $ 0.70
Number of share options expired in share-based payment arrangement |  |  | (1,525,000)
Weighted average exercise price of share options expired in share-based payment arrangement |  |  | $ 2.84
Number of share options outstanding in share-based payment arrangement at end of period |  | 4,283,335 | 5,971,668
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period |  | $ 0.76 | $ 0.79

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