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Share capital - Summary of warrants outstanding (Details) - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of warrants      
Opening balance 1,223,744 2,779,898  
Granted   (1,556,154)  
Expired (13,600)    
Exercised (485,161)    
Ending balance 724,983 1,223,744 2,779,898
Weighted average exercise price      
Opening balance $ 14.35 $ 14.20  
Granted   14.08  
Expired 15.50    
Exercised 15.33    
Ending balance $ 13.81 $ 14.35 $ 14.20
Weighted average remaining contractual life (years)      
Weighted Average Remaining Contractual Life 1 year 2 months 23 days 1 year 8 months 4 days 2 years 5 months 26 days
Granted   1 year 9 months 25 days  
Exercised 3 months 25 days