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Segment Reporting (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2025
EUR (€)
segment
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Segment Reporting [Line Items]      
Revenues € 31,559 € 110,013 € 107,384
Customers One [Member]      
Segment Reporting [Line Items]      
Revenues 5,949 43,684 15,046
Customer Two [Member]      
Segment Reporting [Line Items]      
Revenues € 2,449 € 17,028 € 39,066
Operating segment [Member]      
Segment Reporting [Line Items]      
Operating segments (in segment) | segment 2