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Share capital (Schedule of Warrants Issued and Outstanding) (Details)
 9 Months Ended
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