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

Share capital - Warrants outstanding (Details)

v3.21.1
Share capital - Warrants outstanding (Details) - Warrants
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Disclosure of classes of share capital [line items]        
Weighted average contractual life 1 year 6 months 22 days      
Number of warrants outstanding | shares 15,070,883 15,070,883 20,603,396 22,369,718
Non-Transferable Warrants $0.80 CAD - $16.00 CAD        
Disclosure of classes of share capital [line items]        
Weighted average contractual life 10 months 24 days      
Number of warrants outstanding | shares 9,231,196 9,231,196    
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 $ 16.00      
Non-Transferable Warrants $2.00 USD - $24.00 USD        
Disclosure of classes of share capital [line items]        
Weighted average contractual life 2 years 8 months 1 day      
Number of warrants outstanding | shares 1,338,319 1,338,319    
Non-Transferable Warrants $2.00 USD - $24.00 USD | Minimum        
Disclosure of classes of share capital [line items]        
Exercise price   $ 2.00    
Non-Transferable Warrants $2.00 USD - $24.00 USD | Maximum        
Disclosure of classes of share capital [line items]        
Exercise price   24.00    
Transferable Warrants $4.25 USD        
Disclosure of classes of share capital [line items]        
Exercise price   $ 4.25    
Weighted average contractual life 2 years 7 months 6 days      
Number of warrants outstanding | shares 4,501,368 4,501,368