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Operating expenses - Narrative (Details)
€ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
EUR (€)
Jun. 30, 2025
EUR (€)
employee
Jun. 30, 2024
EUR (€)
employee
Disclosure Of Operating Expenses      
Increase (decrease) in employee benefit expense   € 200  
Percentage change in employee benefit expense   3.70%  
Key management personnel compensation € 500 € 3,094 € 2,722
Severance expenses   200  
Decrease in depreciation expense   € 400  
Number of employees | employee   103 110
Percentage of increase in employee benefit expense   22.90%  
Increase in employee benefit expense   € 800  
Expense from share-based payment transactions with employees   2,161 € 1,940
Other non recurring expenses   12 € 137
Research and Development      
Disclosure Of Operating Expenses      
Key management personnel compensation   200  
SG&A      
Disclosure Of Operating Expenses      
Key management personnel compensation   300  
Employment Termination Indemnities      
Disclosure Of Operating Expenses      
Other non recurring expenses   129  
R&D      
Disclosure Of Operating Expenses      
Increase in purchases, sub-contracting and other expenses   € 7,600  
Number of employees | employee   72 77
SG&A      
Disclosure Of Operating Expenses      
Increase (decrease) in employee benefit expense   € 700  
Percentage change in employee benefit expense   11.10%  
Decrease in purchases, fees, and other expenses   € 200  
Number of employees | employee   31 33