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Fair value measurement and Other non-operating (losses) / gains - Contingent Consideration (Details)
$ in Thousands, € in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2022
EUR (€)
Jul. 30, 2021
USD ($)
Jul. 30, 2021
EUR (€)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent consideration, net of current portion $ 9,334 $ 29,542      
Contingent consideration 35,300        
Current portion of contingent consideration 25,982        
Liability related to post acquisition services $ 300 $ 800      
Maximum          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent consideration discount rate percentage   11.90%      
Minimum          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent consideration discount rate percentage   10.90%      
One hundred percent likelihood of AMT-260 advancing into clinical development          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Percentage of increase in Probability of Success 100.00%        
Change in fair value (presented within research and development expenses) $ 48,800        
Acquisition of Corlieve          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent consideration, net of current portion $ 35,300 $ 29,500   $ 24,000 € 20.2
Percentage of increase in Probability of Success 66.00% 55.00%      
Acquisition of Corlieve | Maximum          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent consideration payable upon achievement of contractually defined milestones $ 191,400   € 178.8    
Contingent consideration discount rate percentage 14.40%        
Acquisition of Corlieve | Minimum          
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Contingent consideration discount rate percentage 14.00%