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Operating expenses - Selling, General and Administrative, Additional Information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Operating Expenses [Line Items]    
Advisory fees   € 1.4
Janssen    
Disclosure Of Operating Expenses [Line Items]    
Legal fees   0.5
JJDC    
Disclosure Of Operating Expenses [Line Items]    
Legal fees   0.3
Selling, general and administrative expense    
Disclosure Of Operating Expenses [Line Items]    
Increase (decrease) in rent, fees, and other expenses € (1.8) € 2.1
Increase (decrease) in rent, fees, and other expenses, percentage (18.40%) 27.00%