Shareholders’ equity - Share capital issued (Details) - EUR (€) € / shares in Units, € in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Disclosure of classes of share capital [line items]
Equity	€ 366,266	€ 455,205	€ (48,280)	€ 40,584
Number of shares issued (in shares)	79,817,069	78,536,412	63,471,933	63,347,837
Par value per share (in euro per share)	€ 0.01
Number of treasury shares held (in shares)	0	0
Number of shares outstanding (in shares)	79,817,069	78,536,412
Issued capital
Disclosure of classes of share capital [line items]
Equity	€ 798	€ 785	€ 635	€ 633

The amount of residual interest in the assets of the entity after deducting all its liabilities.

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+ Details