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Disclosure on Individual Items of the Consolidated Financial Statements - Schedule of Cash Flows Arising from Financing Activities (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule of Cash Flows Arising from Financing Activities [Line Items]      
Balance € 136,394 € 38,968 € 5,915
Proceeds from shareholder loans 6,275 13,967 12,033
Proceeds from convertible notes 38,156    
Proceeds from the issue of warrants 9,000 8,592
Proceeds from the exercise of warrants 26,950 9,260  
Repayment of shareholder loans (22,026) (11,225) (703)
Repayment of convertible notes (21,231)    
Repayment of lease liabilities (1,222) (996) (912)
Interest paid (12,511) (1,174) (259)
Total changes from financing cash flows 23,390 9,832 18,751
Effect of changes in foreign exchange rates (12,964) 7,513 (339)
Changes in fair value (31,842) 65,895 10,859
Other changes (84,298) 2,077  
Additions to lease liabilities 1,020 1,034 871
Interest expense recognized in profit and loss   11,075 2,911
Interest expense recognized in profit and loss 31,306    
Total liability-related other changes (96,778) 87,594 14,302
Balance 63,006 136,394 38,968
Short-term borrowings [member]      
Schedule of Cash Flows Arising from Financing Activities [Line Items]      
Balance 13,333 13,908
Proceeds from shareholder loans 6,275 12,033
Proceeds from convertible notes    
Proceeds from the issue of warrants
Proceeds from the exercise of warrants  
Repayment of shareholder loans (22,026) (11,225) (703)
Repayment of convertible notes    
Repayment of lease liabilities
Interest paid (2,152) (1,018) (106)
Total changes from financing cash flows (17,903) (12,243) 11,224
Effect of changes in foreign exchange rates (822) 845 (83)
Changes in fair value
Other changes 45 (96) [1]  
Additions to lease liabilities
Interest expense recognized in profit and loss   10,919 2,767
Interest expense recognized in profit and loss 10,357    
Total liability-related other changes 9,580 11,668 2,684
Balance 5,010 13,333 13,908
Leases [Member]      
Schedule of Cash Flows Arising from Financing Activities [Line Items]      
Balance 119,581 21,626 2,439
Proceeds from shareholder loans 13,967
Proceeds from convertible notes    
Proceeds from the issue of warrants 9,000 8,592
Proceeds from the exercise of warrants 26,950 9,260  
Repayment of shareholder loans
Repayment of convertible notes    
Repayment of lease liabilities
Interest paid 0 0
Total changes from financing cash flows 35,950 23,227 8,592
Effect of changes in foreign exchange rates (11,341) 6,660 (264)
Changes in fair value (31,842) 65,895 10,859
Other changes (57,540) 2,173 [1]
Additions to lease liabilities 0 0
Interest expense recognized in profit and loss  
Interest expense recognized in profit and loss    
Total liability-related other changes (100,723) 74,728 10,595
Balance 54,808 119,581 21,626
Lease liabilities [member]      
Schedule of Cash Flows Arising from Financing Activities [Line Items]      
Balance 3,480 3,434 3,477
Proceeds from shareholder loans
Proceeds from convertible notes    
Proceeds from the issue of warrants
Proceeds from the exercise of warrants  
Repayment of shareholder loans
Repayment of convertible notes    
Repayment of lease liabilities (1,222) (996) (912)
Interest paid (154) (156) (153)
Total changes from financing cash flows (1,376) (1,152) (1,065)
Effect of changes in foreign exchange rates (39) 8 8
Changes in fair value
Other changes (51) [1]
Additions to lease liabilities 1,020 1,034 871
Interest expense recognized in profit and loss   156 144
Interest expense recognized in profit and loss 154    
Total liability-related other changes 1,084 1,198 1,023
Balance 3,188 3,480 € 3,434
Convertible notes [Member]      
Schedule of Cash Flows Arising from Financing Activities [Line Items]      
Balance 0    
Proceeds from shareholder loans    
Proceeds from convertible notes 38,156    
Proceeds from the issue of warrants    
Proceeds from the exercise of warrants    
Repayment of shareholder loans    
Repayment of convertible notes (21,231)    
Repayment of lease liabilities    
Interest paid (10,204)    
Total changes from financing cash flows 6,721    
Effect of changes in foreign exchange rates (763)    
Changes in fair value    
Other changes (26,753)    
Additions to lease liabilities    
Interest expense recognized in profit and loss 20,795    
Total liability-related other changes (6,721)    
Balance € 0 € 0  
[1] Other changes in warrant liabilities include non-cash effective changes that are related to the exercise of warrants and increased equity; other changes related to the convertible notes are non-cash effective changes due to the conversion of debt and interest into equity.