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Share capital - Schedule of fair value assumptions of warrants (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of warrants [Line Items]    
Weighted average share price of warrants $ 32.16  
Expected dividend yield of warrants granted 0.00% 0.00%
Expected life of warrants   2 years
Expected volatility of warrants granted 100.00% 100.00%
Bottom of range    
Disclosure of warrants [Line Items]    
Weighted average share price of warrants   $ 4.42
Exercise price of warrants granted $ 2.61 $ 4.42
Risk free interest rate of warrants granted 1.41% 1.70%
Expected life of warrants 1 year 4 months 20 days  
Top of range    
Disclosure of warrants [Line Items]    
Weighted average share price of warrants   $ 18.09
Exercise price of warrants granted $ 26.73 $ 26.13
Risk free interest rate of warrants granted 1.52% 2.17%
Expected life of warrants 6 years 6 months 18 days