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Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses - EUR (€)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses € 41,024,131 € 37,526,090 € 35,697,935
Third-party services [Member]      
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses 31,802,983 28,543,503 28,247,081
Clinical material and related manufacturing services [Member]      
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses 18,109,345 16,194,152 6,615,840
Clinical, pre-clinical studies [Member]      
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses 13,693,638 12,349,351 21,631,240
Employee benefits expenses [Member]      
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses 6,776,853 6,957,866 5,941,813
Equity-settled share-based payment expense [Member]      
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses 1,500,670 2,456,571 1,622,898
Legal and consulting fees [Member]      
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses 1,758,283 1,690,448 1,074,710
Other expenses [Member]      
Consolidated Statements of Operations and Comprehensive Loss (Details) - Schedule of Research and Development Expenses [Line Items]      
Research and development expenses € 686,012 € 334,273 € 434,331