v3.26.1
FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Carrying amounts and fair values (Details) - EUR (€)
€ in Thousands
Dec. 31, 2025
Aug. 31, 2025
Dec. 31, 2024
Financial instruments      
Fair value, financial assets € 8,478 € 8,584  
Black forest term loan facility Loans | Level 3      
Financial instruments      
Fair value, financial liabilities 5,290    
FVTPL      
Financial instruments      
Carrying amount, financial liabilities 40,843   € 5,053
FVTPL | XJ Harbour Set-off agreement | Level 3      
Financial instruments      
Carrying amount, financial liabilities 9,459    
Fair value, financial liabilities 9,459    
FVTPL | Warrants | Level 1      
Financial instruments      
Carrying amount, financial liabilities 26,094    
Fair value, financial liabilities 26,094    
FVTPL | Black forest term loan facility Loans | Level 3      
Financial instruments      
Carrying amount, financial liabilities 5,290    
FVTPL | XJ Harbour Set-off agreement | Level 1      
Financial instruments      
Carrying amount, financial liabilities 64,267    
Fair value, financial liabilities 64,267    
FLAC      
Financial instruments      
Carrying amount, financial liabilities 155,893   105,612
FLAC | Loans from banks      
Financial instruments      
Carrying amount, financial liabilities 1,191    
FLAC | Black forest term loan facility      
Financial instruments      
Carrying amount, financial liabilities 574    
FLAC | Loans from other third parties      
Financial instruments      
Carrying amount, financial liabilities 2,200   2,000
Fair value, financial liabilities     2,130
FLAC | Loans from shareholders      
Financial instruments      
Carrying amount, financial liabilities 21,000   21,000
Fair value, financial liabilities     22,365
FLAC | Loans from other related parties      
Financial instruments      
Carrying amount, financial liabilities 11,000   14,000
Fair value, financial liabilities     15
FLAC | Warrants | Level 1      
Financial instruments      
Carrying amount, financial liabilities     5,053
Fair value, financial liabilities     5,053
FLAC | Loans from banks      
Financial instruments      
Carrying amount, financial liabilities 1,232   2,219
FLAC | Loans from other third parties      
Financial instruments      
Carrying amount, financial liabilities 3,114   26,547
FLAC | Loans from shareholders      
Financial instruments      
Carrying amount, financial liabilities 4,611   8,694
FLAC | Loans from other related parties      
Financial instruments      
Carrying amount, financial liabilities 8,634   2,973
FLAC | Trade and related party payables      
Financial instruments      
Carrying amount, financial liabilities 38,071    
FLAC | Trade payables and other liabilities      
Financial instruments      
Carrying amount, financial liabilities     28,179
AC      
Financial instruments      
Carrying amount, financial assets 35,286   42,212
AC | Other loans and investments      
Financial instruments      
Carrying amount, financial assets 3   66
Fair value, financial assets     66
AC | Other non-current financial assets      
Financial instruments      
Carrying amount, financial assets     69
AC | Trade receivables      
Financial instruments      
Carrying amount, financial assets 28,865   24,704
AC | Receivables from equity method investees      
Financial instruments      
Carrying amount, financial assets 4,435   4,207
AC | Other receivables      
Financial instruments      
Carrying amount, financial assets 353   4,599
AC | Receivables from shareholder      
Financial instruments      
Carrying amount, financial assets     4,711
AC | Restricted cash      
Financial instruments      
Carrying amount, financial assets 0   59
AC | Cash and cash equivalents      
Financial instruments      
Carrying amount, financial assets 1,574   3,791
AC | Other      
Financial instruments      
Carrying amount, financial assets     € 5,243
FVTPL      
Financial instruments      
Carrying amount, financial assets 16,191    
FVTPL | Group14 shares | Level 3      
Financial instruments      
Carrying amount, financial assets 8,478    
Fair value, financial assets 8,478    
FVTPL | XJ Harbour price protection cap derivative | Level 3      
Financial instruments      
Carrying amount, financial assets 7,713    
Fair value, financial assets 7,713    
FVTPL | Other non-current financial assets      
Financial instruments      
Carrying amount, financial assets € 9