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General Information, Statement of Compliance and Basis of Presentation (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
General Information, Statement of Compliance and Basis of Presentation [Abstract]
Net losses	€ 68,132	€ 39,700	€ 57,041
Accumulated deficit	380,400
Decrease in cash and cash equivalents	25,547	(33,895)	42,533
Cash and cash equivalents	€ 49,737	€ 75,283	€ 41,388	€ 83,921

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The increase (decrease) in cash and cash equivalents after the effect of exchange rate changes on cash and cash equivalents held in foreign currencies. [Refer: Cash and cash equivalents; Effect of exchange rate changes on cash and cash equivalents]

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