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Trade payables and other current liabilities - Narrative (Details) - EUR (€)
€ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2021
Disclosure of Trade Payables and Other Current Liabilities [Line Items]      
Change in accrued expenses € 7,413 € 15,550  
Decrease in payroll tax and other payroll liabilities 500    
Decrease in bonus accrual 900    
Adjustments for increase (decrease) in contract liabilities 18,100   € 16,500
Current contract liabilities 36,172 18,100  
Decrease in refund liabilities 28,200    
1100 study      
Disclosure of Trade Payables and Other Current Liabilities [Line Items]      
Change in accrued expenses 5,300    
NANORAY-312      
Disclosure of Trade Payables and Other Current Liabilities [Line Items]      
Decrease in accrued expenses 8,100 8,100  
Change in accrued expenses € 1,800 11,100  
Increase of other trade payables   € 4,400