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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 |

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