v3.26.3
FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Carrying amounts and fair values (Details) - EUR (€)
€ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Aug. 31, 2025
Dec. 31, 2024
FAIR VALUE MEASUREMENT        
Fair value, financial assets   € 8,478 € 8,584  
Level 3        
FAIR VALUE MEASUREMENT        
Fair value, financial liabilities € 33,597 18,143    
Black forest term loan facility Loans | Level 3        
FAIR VALUE MEASUREMENT        
Fair value, financial liabilities   5,290    
FVTPL        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   40,843   € 5,053
FVTPL | XJ Harbour Set-off agreement | Level 3        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   9,459    
Fair value, financial liabilities   9,459    
FVTPL | Warrants | Level 1        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   26,094    
Fair value, financial liabilities   26,094    
FVTPL | Black forest term loan facility Loans | Level 3        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   5,290    
FVTPL | XJ Harbour Set-off agreement | Level 1        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   64,267    
Fair value, financial liabilities   64,267    
FLAC        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   155,893   105,612
FLAC | Loans from banks        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   1,191    
FLAC | Black forest term loan facility        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   574    
FLAC | Loans from other third parties        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   2,200   2,000
Fair value, financial liabilities       2,130
FLAC | Loans from shareholders        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   21,000   21,000
Fair value, financial liabilities       22,365
FLAC | Loans from other related parties        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   11,000   14,000
Fair value, financial liabilities       15
FLAC | Warrants | Level 1        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities       5,053
Fair value, financial liabilities       5,053
FLAC | Loans from banks        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   1,232   2,219
FLAC | Loans from other third parties        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   3,114   26,547
FLAC | Loans from shareholders        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   4,611   8,694
FLAC | Loans from other related parties        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   8,634   2,973
FLAC | Trade and related party payables        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities   38,071    
FLAC | Trade payables and other liabilities        
FAIR VALUE MEASUREMENT        
Carrying amount, financial liabilities       28,179
AC        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   35,286   42,212
AC | Other loans and investments        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   3   66
Fair value, financial assets       66
AC | Other non-current financial assets        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets       69
AC | Trade receivables        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   28,865   24,704
AC | Receivables from equity method investees        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   4,435   4,207
AC | Other receivables        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   353   4,599
AC | Receivables from shareholder        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets       4,711
AC | Restricted cash        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   0   59
AC | Cash and cash equivalents        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   1,574   3,791
AC | Other        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets       € 5,243
FVTPL        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   16,191    
FVTPL | Group14 shares | Level 3        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   8,478    
Fair value, financial assets   8,478    
FVTPL | XJ Harbour price protection cap derivative | Level 3        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   7,713    
Fair value, financial assets   7,713    
FVTPL | Other non-current financial assets        
FAIR VALUE MEASUREMENT        
Carrying amount, financial assets   € 9