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Disclosure on Individual Items of the Consolidated Financial Statements - Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region € 31,559 € 110,013 € 107,384
Germany [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 15,654 83,662 77,449
Belgium [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 4,423 394 18
Netherlands [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 3,246 2,395 4,770
Austria [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 3,246 1,310 1,389
United States of America [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 2,454 5,623 4,971
Sweden [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 643 392 8,688
Spain [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 413 144 143
Ireland [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 356 11,577 8,050
Australia [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 330 2 199
Switzerland [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 174 422 1,462
Great Britain [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 140 165 15
France [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 126 1,205 6
Italy [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 126
Greece [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region 46 2,503
Rest of the world [Member]      
Schedule of Revenue from Contracts with Customers Disaggregated by Geographical Region [Line Items]      
Revenue by region € 182 € 219 € 224