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Share capital - Summary of warrants outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of warrants      
Opening balance 772,270 724,983  
Expired (458,477)    
Exercised (313,793)    
Granted   47,287  
Ending balance   772,270 724,983
Weighted average exercise price      
Opening balance $ 13.29 $ 13.81  
Expired 14.00    
Exercised $ 13.48    
Granted   5.29  
Ending balance   $ 13.29 $ 13.81
Weighted average remaining contractual life (years)      
Weighted Average Remaining Contractual Life   9 months 25 days 1 year 2 months 23 days
Granted   9 years 9 months 18 days  
Total cash proceeds $ 2,423