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Share-based payments - RSUs (Details) - shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Opening Balance 60,000    
Granted 25,000 60,000  
Vested (10,000)    
Ending Balance 75,000 60,000  
RSUs      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Opening Balance 443,861 232,317  
Granted 235,500 385,083  
Vested (162,131) (62,738)  
Forfeited (23,834) (110,801)  
Ending Balance 493,396 443,861 232,317
Weighted average remaining contractual life (years) 1 year 11 months 26 days 2 years 4 months 17 days 2 years 5 months 12 days
Granted 3 years 3 years  
Forfeited 1 year 6 months 21 days 2 years 1 month 20 days