v3.26.3
Intangible Assets and Goodwill - Summary of Detailed Information About Intangible Assets (Detail) - EUR (€)
€ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Disclosure of detailed information about intangible assets [line items]    
Beginning balance € 39,778  
Additions 3,444  
Impairment of assets 0  
Amortization for the period (2,701)  
Translation differences 74  
Ending balance 40,595 [1] € 39,778
Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 162,874  
Ending balance 166,392 162,874
Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (72,651)  
Ending balance (75,352) (72,651)
Impairment of assets    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (50,445)  
Ending balance (50,445) (50,445)
Software    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 6,227  
Additions 70 334
Impairment of assets 0  
Amortization for the period (331)  
Translation differences 43  
Ending balance 6,009 6,227
Software | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 16,532  
Ending balance 16,645 16,532
Software | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (7,544)  
Ending balance (7,875) (7,544)
Software | Impairment of assets    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (2,761)  
Ending balance (2,761) (2,761)
Trademarks, industrial property and customer relationships    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 2,158  
Additions 0  
Impairment of assets 0  
Amortization for the period (474)  
Translation differences 31  
Ending balance 1,715 2,158
Trademarks, industrial property and customer relationships | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 20,574  
Ending balance 20,605 20,574
Trademarks, industrial property and customer relationships | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (4,157)  
Ending balance (4,631) (4,157)
Trademarks, industrial property and customer relationships | Impairment of assets    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (14,259)  
Ending balance (14,259) (14,259)
Development costs    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 31,393  
Additions 3,374 8,435
Impairment of assets 0  
Amortization for the period (1,896)  
Translation differences 0  
Ending balance 32,871 31,393
Development costs | Gross carrying amount    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 125,768  
Ending balance 129,142 125,768
Development costs | Accumulated depreciation and amortisation    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (60,950)  
Ending balance (62,846) (60,950)
Development costs | Impairment of assets    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (33,425)  
Ending balance € (33,425) € (33,425)
[1] Unaudited