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Share-based payments - Assumptions used in the valuation model (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Expected volatility   48.27%
Risk free interest rate   0.14%
Dividend yield   0.00%
Stock Options    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Expected term 6 years  
Expected volatility 32.00%  
Risk free interest rate 3.00%  
Dividend yield 0.00%  
Weighted average exercise price $ 52.38