Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share capital (Details 4)

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Share capital (Details 4) - Warrants - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of classes of share capital [line items]      
Number of warrants outstanding 22,369,718 11,856,857 9,266,793
Non-Transferable Warrants $0.80 CAD - $16.00 CAD      
Disclosure of classes of share capital [line items]      
Weighted average contractual life 2 years 9 months 4 days    
Number of warrants outstanding 11,457,559    
Non-Transferable Warrants $0.80 CAD - $16.00 CAD | Minimum      
Disclosure of classes of share capital [line items]      
Exercise price $ 0.80    
Non-Transferable Warrants $0.80 CAD - $16.00 CAD | Maximum      
Disclosure of classes of share capital [line items]      
Exercise price $ 16    
Non-Transferable Warrants $2.00 USD - $24.00 USD      
Disclosure of classes of share capital [line items]      
Weighted average contractual life 4 years 7 months 24 days    
Number of warrants outstanding 5,764,492    
Non-Transferable Warrants $2.00 USD - $24.00 USD | Minimum      
Disclosure of classes of share capital [line items]      
Exercise price $ 2    
Non-Transferable Warrants $2.00 USD - $24.00 USD | Maximum      
Disclosure of classes of share capital [line items]      
Exercise price $ 24    
Transferable Warrants $4.25 USD      
Disclosure of classes of share capital [line items]      
Weighted average contractual life 4 years 7 months 10 days    
Number of warrants outstanding 5,147,668