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v3.26.1

Basis of preparation (Details) € in Thousands, $ in Millions |  |  | 1 Months Ended | 12 Months Ended | 145 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 24, 2023 EUR (€) | Oct. 24, 2023 USD ($) | Sep. 02, 2022 EUR (€) | Jul. 31, 2025 EUR (€) | Oct. 31, 2023 EUR (€) | Feb. 28, 2023 EUR (€) | Dec. 31, 2025 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2025 EUR (€)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  | € 336,102 | € 176,242 | € 147,740 |
Capital increases | € 223,300 | $ 235.8 |  |  |  |  | 648,124 | 0 | € 353,377 | € 1,194,700
Proceeds from borrowings |  |  |  |  |  |  |  |  |  | 175,000
Proceeds from research tax credit |  |  |  |  |  |  | 5,640 | € 4,493 |  | 41,200
Net proceeds from sale of royalty certificates |  |  | € 2,931 |  |  |  |  |  |  | 2,900
Cash and cash equivalents and other short-term investments |  |  |  |  |  |  | € 530,400 |  |  | 530,400
Conditional advances Bpifrance |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Proceeds from government grants |  |  |  |  |  |  |  |  |  | 17,100
Proceeds from conditional advances |  |  |  |  |  |  |  |  |  | € 1,800
Registered direct offering |  |  |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |  |  |
Capital increases |  |  |  | € 637,500 | € 223,300 | € 130,000 |  |  |  |

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