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Income (loss) per share - Schedule of earnings per share (Details) - EUR (€) € / shares in Units, € in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings per share [abstract]
Weighted average number of outstanding shares, basic loss per share (in shares)	69,527,315	63,046,350	43,066,012
Weighted average number of outstanding shares, diluted loss per share (in shares)	69,527,315	63,046,350	43,066,012
Net loss for the period	€ (336,102)	€ (176,242)	€ (147,740)
Basic loss per share (in euro per share)	€ (4.83)	€ (2.80)	€ (3.43)
Diluted loss per share (in euro per share)	€ (4.83)	€ (2.80)	€ (3.43)

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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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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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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