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Share capital (Schedule of Warrants Issued and Outstanding) (Details) | 9 Months Ended
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Sep. 30, 2018 CAD ($) shares
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 4,091,623
CAD 4.68 Issued Jul 2016 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 799,065
Exercise price | $ | $ 4.68
Issuance date | Jul 2016
Expiry date | Jun 14, 2021
CAD 4.68 Issued Jun 2016 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 1,447,426
Exercise price | $ | $ 4.68
Issuance date | Jun 2016
Expiry date | Jun 9, 2021
CAD 1.20 Issued Feb 2016 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 1,537,355
Exercise price | $ | $ 1.2
Issuance date | Feb 2016
Expiry date | Feb 10, 2019
CAD 1.20 Issued Nov 2015 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 307,777
Exercise price | $ | $ 1.2
Issuance date | Nov 2015
Expiry date | Nov 10, 2018

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