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Income tax (Tables) | 12 Months Ended
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Dec. 31, 2025
Income taxes paid (refund) [abstract] |
Disclosure of reconciliation of effective income tax (loss) |
(In thousands of euros, except percentage) |  | YEAR ENDED DECEMBER 31, 2023 |  | YEAR ENDED DECEMBER 31, 2024 |  | YEAR ENDED DECEMBER 31, 2025
Loss before tax |  | (147,740) |  | (176,242) |  | (330,254)
Statutory French tax rate |  | 25% |  | 25% |  | 25%
Nominal income tax using statutory French tax rate |  | 36,935 |  | 44,061 |  | 82,563
Tax effect of: |  |  |  |  |  |
Tax rates in foreign jurisdictions |  | — |  | — |  | (153)
Share-based payment |  | (2,045) |  | (5,056) |  | (8,849)
CIR |  | 1,123 |  | 1,663 |  | 765
Transaction costs related to capital increase |  | 3,073 |  | (112) |  | 10,077
Decrease / (increase) in derivatives and other liabilities measured at FVTPL |  | 748 |  | (207) |  | (17,087)
Non-recognition of deferred tax assets related to tax losses and temporary differences |  | (39,612) |  | (40,399) |  | (61,320)
Other |  | (222) |  | 49 |  | (148)
Effective income tax (loss) |  | — |  | — |  | (5,848)
Disclosure of deferred tax assets and liabilities by nature |
(In thousands of euros) |  |  |  |  |  |
DEFERRED TAX ASSETS AND LIABILITIES BY NATURE |  | AS OF DECEMBER 31, 2023 |  | AS OF DECEMBER 31, 2024 |  | AS OF DECEMBER 31, 2025
Retirement benefit obligation |  | 157 |  | 189 |  | 157
Leases |  | 135 |  | 591 |  | 476
Other financial liabilities |  | 351 |  | 1,678 |  | —
Provisions for AGA taxes |  | 83 |  | 142 |  | 11,454
Tax losses carryforward |  | 114,946 |  | 152,372 |  | 228,239
Other items |  | 335 |  | 744 |  | 1,568
Deferred tax assets |  | 116,006 |  | 155,715 |  | 241,894
Subsidies |  | 24 |  | 12 |  | —
Leases |  | 124 |  | 485 |  | 396
Royalty certificates |  | — |  | — |  | 17,208
Other financial liabilities |  | 285 |  | 1,075 |  | —
Other items |  | 10 |  | 12 |  | 11
Deferred tax liabilities |  | 444 |  | 1,584 |  | 17,616
Deferred tax assets, net |  | 115,562 |  | 154,131 |  | 224,279
Unrecognized deferred tax assets |  | (115,562) |  | (154,131) |  | (230,127)
Total deferred taxes, net recognized in the statement of financial position |  | — |  | — |  | (5,848)

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- Definition Disclosure Of Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates And Average Effective Tax Rate + References No definition available. + Details
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- Definition The disclosure of types of temporary differences, unused tax losses and unused tax credits. [Refer: Unused tax credits [member]; Unused tax losses [member]; Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2025-01-01 -Paragraph 81 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_g&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 194 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_f&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 194 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_f&doctype=Standard -URIDate 2025-03-27 + Details
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