v3.26.3
Disclosure on Individual Items of the Consolidated Financial Statements - Schedule of Fair Values of all Financial Assets and Financial Liabilities (Details) - EUR (€)
€ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2024
Financial assets      
Financial assets, Carrying amount € 81,605 € 90,249  
Financial liabilities      
Financial liabilities, Carrying amount € 73,838 101,071 € 188,039
Cash and cash equivalents [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 4,589 6,987  
Financial assets, Fair value € 4,589 6,987  
Trade receivables (current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 3,472 5,289  
Financial assets, Fair value € 3,472 5,289  
Other investments (non-current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 859 6  
Financial assets, Fair value € 859 6  
Other financial receivables (current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 200 903  
Financial assets, Fair value € 200 903  
Other financial receivables (non-current) [Member]      
Financial assets      
Financial assets, Classification At amortized cost    
Financial assets, Carrying amount € 26 25  
Financial assets, Fair value 26 25  
Financial Assets [Member]      
Financial assets      
Financial assets, Carrying amount 9,146 13,212  
Financial assets, Fair value € 9,146 13,212  
Loans and borrowings (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 15,880 48,560  
Financial liabilities, Fair value € 15,880 48,560  
Trade payables (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 11,096 16,731  
Financial liabilities, Fair value € 11,096 16,731  
Trade payables due to related parties (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 1,069 1,822  
Financial liabilities, Fair value € 1,069 1,822  
Lease liabilities (non-current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 1,286 1,866  
Financial liabilities, Fair value  
Lease liabilities (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 1,334 1,322  
Financial liabilities, Fair value  
Other payables financial (current) [Member]      
Financial liabilities      
Financial liabilities, Classification At amortized cost    
Financial liabilities, Carrying amount € 6,839 333  
Financial liabilities, Fair value 6,839 333  
Financial liabilities [Member]      
Financial liabilities      
Financial liabilities, Carrying amount 48,900 125,442  
Financial liabilities, Fair value € 46,280 122,254  
Level 2 Hierarchy [Member] | Warrant liabilities - private [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount € 3,042 3,061  
Financial liabilities, Fair value € 3,042 3,061  
Level 2 Hierarchy [Member] | Warrant liabilities - Shareholder loan [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount € 5,708 35,376  
Financial liabilities, Fair value € 5,708 35,376  
Level 2 Hierarchy [Member] | Warrant liabilities - convertible notes [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount  
Financial liabilities, Fair value  
Level 1 Hierarchy [Member] | Warrant liabilities - public [Member]      
Financial liabilities      
Financial liabilities, Classification FVTPL    
Financial liabilities, Carrying amount € 2,645 5,112  
Financial liabilities, Fair value € 2,645 € 5,112