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Lease Liabilities (Details) - Office and laboratory facilities at Zernikedreef in Leiden, the Netherlands
€ in Thousands
1 Months Ended 9 Months Ended
Jul. 01, 2020
Dec. 31, 2020
Sep. 30, 2025
EUR (€)
Dec. 31, 2024
EUR (€)
Disclosure of quantitative information about right-of-use assets [line items]        
Area under lease | m²     4,818  
Lease term 10 years 11 years    
Lease extension term   1 year    
Lease, current extension period under option     5 years  
Right-of-use asset | €     € 10,448 € 11,433