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

Share capital - Warrants outstanding (Details)

v3.20.1
Share capital - Warrants outstanding (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Disclosure of classes of share capital [line items]        
Exercise price $ 4.25      
Warrants        
Disclosure of classes of share capital [line items]        
Number of warrants outstanding | shares 20,603,396 20,603,396 22,369,718 11,856,857
Warrants | Non-Transferable Warrants $0.80 CAD - $16.00 CAD        
Disclosure of classes of share capital [line items]        
Weighted average contractual life 1 year 9 months 22 days      
Number of warrants outstanding | shares 11,010,059 11,010,059    
Warrants | Non-Transferable Warrants $0.80 CAD - $16.00 CAD | Minimum        
Disclosure of classes of share capital [line items]        
Exercise price   $ 0.80    
Warrants | Non-Transferable Warrants $0.80 CAD - $16.00 CAD | Maximum        
Disclosure of classes of share capital [line items]        
Exercise price   $ 16.00    
Warrants | Non-Transferable Warrants $2.00 USD - $24.00 USD        
Disclosure of classes of share capital [line items]        
Weighted average contractual life 4 years 1 month 24 days      
Number of warrants outstanding | shares 5,091,969 5,091,969    
Warrants | Non-Transferable Warrants $2.00 USD - $24.00 USD | Minimum        
Disclosure of classes of share capital [line items]        
Exercise price $ 2.00      
Warrants | Non-Transferable Warrants $2.00 USD - $24.00 USD | Maximum        
Disclosure of classes of share capital [line items]        
Exercise price 24.00      
Warrants | Transferable Warrants $4.25 USD        
Disclosure of classes of share capital [line items]        
Exercise price $ 4.25      
Weighted average contractual life 3 years 7 months 10 days      
Number of warrants outstanding | shares 4,501,368 4,501,368