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Income taxes - Income (loss) before income tax (expense) benefit (Details)
$ in Thousands, € in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jul. 30, 2021
USD ($)
Jul. 30, 2021
EUR (€)
Loss before income taxes          
Unrecognized Tax Benefits $ 0 $ 0      
Dutch operations (96,872) 348,400 $ (130,493)    
(Loss) / income before income tax benefit / (expense) (128,259) 332,806 (141,443)    
Current tax expense          
Total current tax (expense) (24) (7)      
Deferred tax benefit / (expense)          
Dutch operations (808) (3,047)      
Total deferred tax benefit / (expense) 1,494 (3,210) 16,419    
Total income tax benefit / (expense) 1,470 (3,217) 16,419    
Acquisition of Corlieve          
Loss before income taxes          
Deferred tax liability, net       $ 14,200 € 11.9
U.S. operations          
Loss before income taxes          
Loss before income tax benefit / (expense) (14,934) (12,737) (10,950)    
Deferred tax benefit / (expense)          
Deferred tax benefit / (expense) (1,075) (771) $ 16,419    
Other          
Loss before income taxes          
Loss before income tax benefit / (expense) (16,453) (2,857)      
Current tax expense          
Current tax (expense) (24) (7)      
Deferred tax benefit / (expense)          
Deferred tax benefit / (expense) $ 3,377 $ 608