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Share capital (Schedule of Warrants Issued and Outstanding) (Details) | 12 Months Ended
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Dec. 31, 2017 CAD shares
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 5,167,391
CAD 4.68 Issued Jul 2016 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 742,883
Exercise price | CAD | CAD 4.68
Issuance date | Jul 2016
Expiry date | Jun 14, 2021
CAD 4.20 Issued Jul 2016 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 224,728
Exercise price | CAD | CAD 4.2
Issuance date | Jul 2016
Expiry date | Jun 14, 2018
CAD 4.68 Issued Jun 2016 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 1,350,204
Exercise price | CAD | CAD 4.68
Issuance date | Jun 2016
Expiry date | Jun 9, 2021
CAD 4.20 Issued Jun 2016 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 388,886
Exercise price | CAD | CAD 4.2
Issuance date | Jun 2016
Expiry date | Jun 9, 2018
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 | CAD | CAD 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 | CAD | CAD 1.2
Issuance date | Nov 2015
Expiry date | Nov 10, 2018
CAD 1.56 Issued Aug 2015 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 29,166
Exercise price | CAD | CAD 1.56
Issuance date | Aug 2015
Expiry date | Aug 26, 2018
CAD 3.00 Issued Aug 2015 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 190,906
Exercise price | CAD | CAD 3
Issuance date | Aug 2015
Expiry date | Aug 26, 2018
CAD 1.56 Issued May 2015 [Member] |
Disclosure of range of exercise prices of outstanding share options [line items] |
Number of warrants | 395,486
Exercise price | CAD | CAD 1.56
Issuance date | May 2015
Expiry date | May 27, 2018

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