v3.26.3
Property, Plant and Equipment - Additional Information (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [line items]        
Additions to property plant and equipment € 67      
Additions of property plant and equipment pending of payment 430 € 441    
Contractual commitment for property plant and equipment 284 95    
Property plant and equipment pledged as security 24,789 24,789 € 24,789 € 24,789
Property, plant and equipment fully depreciated assets still in use € 5,185 3,609    
Percentage of share capital pledged as collateral 100.00%      
Inventories net book value € 4,534      
Leasehold improvements        
Disclosure of detailed information about property, plant and equipment [line items]        
Leasehold improvement € 23,531 € 23,530