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Share based compensation - Share Options Issued (Details) - $ / shares
1 Months Ended 12 Months Ended
Sep. 30, 2022
Aug. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 01, 2022
Aug. 11, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock based compensation (in shares)         0    
Share options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock based compensation (in shares)   5,150,000          
Exercise price (in dollars per share)   $ 2.00 $ 4.75 $ 2.00 $ 0    
Share price (in dollars per share)             $ 1.40
Share options | Tranche 1              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock based compensation (in shares) 1,333,334            
Exercise price (in dollars per share) $ 4.00            
Share price (in dollars per share)           $ 3.96  
Share options | Tranche 2              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock based compensation (in shares) 1,333,333            
Exercise price (in dollars per share) $ 4.75            
Share price (in dollars per share)           3.96  
Share options | Tranche 3              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock based compensation (in shares) 1,333,333            
Exercise price (in dollars per share) $ 5.50            
Share price (in dollars per share)           $ 3.96