Share Capital - Founder's Warrants, Warrants, Stock Options and Free Shares (Details) € in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2025 EUR (€) security	Jun. 30, 2024 EUR (€)	Dec. 31, 2023 EUR (€)
Disclosure Of Share Capital, Reserves And Other Equity Interest [Abstract]
Number of security types (security) \| security	3
Net loss for the period \| €	€ (5,383)	€ (21,872)	€ 68,100

The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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+ Details