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Disclosure on Individual Items of the Consolidated Financial Statements - Schedule of Fair Value Disclosure (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financial assets      
Financial assets, Carrying amount € 90,249 € 145,230  
Financial liabilities      
Financial liabilities, Carrying amount 101,071 188,039 € 90,489
Financial liabilities, Fair value € (31,842) 65,895 € 10,859
Cash and cash equivalents [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 6,987 22,858  
Financial assets, Fair value € 6,987 22,858  
Other investments (non-current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 6 5  
Financial assets, Fair value € 6 5  
Other financial receivables (current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 903 3,358  
Financial assets, Fair value € 903 3,358  
Other financial receivables (non-current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 25 6  
Financial assets, Fair value 25 6  
Financial Assets [Member]      
Financial assets      
Financial assets, Carrying amount 13,212 36,126  
Financial assets, Fair value € 13,212 36,126  
Loans and borrowings (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 48,560 13,333  
Financial liabilities, Fair value € 48,560 13,333  
Trade payables (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 16,731 29,299  
Financial liabilities, Fair value € 16,731 29,299  
Trade payables due to related parties (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 1,822 2,601  
Financial liabilities, Fair value € 1,822 2,601  
Lease liabilities (non-current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 1,866 2,336  
Financial liabilities, Fair value  
Lease liabilities (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 1,322 1,144  
Financial liabilities, Fair value  
Other payables financial (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 333 215  
Financial liabilities, Fair value 333 215  
Financial liabilities [Member]      
Financial liabilities      
Financial liabilities, Carrying amount 81,892 168,509  
Financial liabilities, Fair value € 78,704 165,030  
Level 2 Hierarchy [Member] | Warrant liabilities - private [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount € 3,061 15,826  
Financial liabilities, Fair value € 3,061 15,826  
Level 2 Hierarchy [Member] | Warrant liabilities - Shareholder loan [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount € 35,376 78,849  
Financial liabilities, Fair value € 35,376 78,849  
Level 2 Hierarchy [Member] | Warrant liabilities - convertible notes [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount € 11,259  
Financial liabilities, Fair value € 11,259  
Level 1 Hierarchy [Member] | Warrant liabilities - public [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount € 5,112 24,905  
Financial liabilities, Fair value € 5,112 24,905  
Trade receivables (current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 5,289 9,900  
Financial assets, Fair value € 5,289 € 9,900