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Financial gain (loss) - Disclosure of net financial income (loss) (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Financial Income (Loss) [Abstract] |  |  |
Interest on bond loans | € (7,472) | € (5,800) | € (760)
Interest on convertible loan notes | (3,638) | (5,691) | (3,935)
Interest on conditional advances and PGE | (95) | (85) | (176)
Interest on royalty certificates | (17,213) | (794) | (8,942)
Interest on lease liabilities | (64) | (61) | (13)
(Increase) / decrease in derivatives fair value | (29,935) | (1,462) | (3,046)
(Increase) / decrease in other liabilities / (assets) at fair value through profit and loss | (36,015) | (1,367) | 0
Loss on derecognition of financial liabilities | (3,838) | 0 | (3,431)
Transaction costs | 0 | (1,615) | (1,924)
Foreign exchange losses | (13,444) | (51) | (5,573)
Other financial expense | (29) | (64) | (73)
Financial expenses | (111,743) | (16,991) | (27,875)
Interest income | 5,600 | 8,246 | 2,418
(Increase) / decrease in derivatives fair value | 3,620 | 1,413 | 1,006
(Increase) / decrease in other liabilities / (assets) at fair value through profit and loss | 4,730 | 0 | 3,198
Effect of unwinding the discount related to advances made to CROs | 153 | 710 | 355
Day-one gain on recognition of financial liabilities | 1,557 | 590 | 212
Gain on derecognition of financial liabilities | 0 | 0 | 192
Foreign exchange gains | 11,886 | 2,774 | 0
Other financial income | 0 | 0 | 130
Financial income | 27,545 | 13,732 | 7,511
Financial gain (loss) | € (84,198) | € (3,258) | € (20,364)

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