v3.26.3
Inventories-Additional Information (Detail) - EUR (€)
€ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Inventories [Line Items]      
Impairment of inventories [1] € 1,727 € (278)  
Advance payments 7,892 [2]   € 6,194
Inventories pledged as security for liabilities 11,704   11,250
Inventories net book value 4,534    
Slow Moving and Accrual Obsolescence [Member]      
Inventories [Line Items]      
Impairment of inventories € 9,421   € 8,082
[1] Unaudited
[2] Unaudited