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Share Capital | 6 Months Ended
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Jun. 30, 2025
Disclosure Of Share Capital, Reserves And Other Equity Interest [Abstract] |
Share Capital | Share Capital 10.1 CAPITAL ISSUED Detail of share capital transactions
(in thousands or number of shares) | Nature of transaction | Share Capital | Premiums related to share capital | Number of shares
December 31, 2024 |  | 1,423 |  | 312,743 |  | 47,426,851 |
June 27, 2025 | Capital increase AGA 2023-P1 and AGA 2023-P2 | 24 |  | — |  | 809,820 |
June 30, 2025 |  | 1,447 |  | 312,743 |  | 48,236,671 |
As of June 30, 2025, the share capital was €1,447 thousand divided into 48,236,671 fully paid up ordinary shares, each with a par value of €0.03. Allocation of prior period (loss) The negative net result for the year 2023 of €68.1 million has been fully allocated to reserves. 10.2 FOUNDER’S WARRANTS, WARRANTS, STOCK OPTIONS AND FREE SHARES As of June 30, 2025, there are three different types of securities and other valid instruments entitling their holders to a stake in the Company's share capital: warrant (bons de souscription d’actions or BSA), founders’ warrant (bons de souscription de parts de créateur d’entreprise or BSPCE) and stock option (options de souscription ou d’achat d’actions or OSA). Stock options At a meeting on February 18, 2025, the Executive Board, acting pursuant to delegations granted by the Company’s shareholders’ meeting held on May 28, 2024, granted to certain employees of the Group 8,000 stock options, each giving its holder the right to subscribe one ordinary share, each with a par value of €0.03 and at a price of €3.36 (share premium included). Such stock options are governed by the 2025 stock option plan, adopted by the Executive Board on February 18, 2025 (the “2025 Stock Option Plan”). The ordinary stock options are exercisable as follows: ▪up to one-third of the ordinary stock options as from February 18, 2026; ▪ an additional one-third of the ordinary stock options as from February 18, 2027, ▪ the balance, i.e., one-third of the ordinary stock options as from February 18, 2028, subject to, for each increment, a continued service condition, and in any case, no later than 10 years after the date of grant, it being specified that stock options which have not been exercised by the end of this 10-year period will be forfeited by law. At a meeting on May 16, 2025, the Executive Board, acting pursuant to delegations granted by the Company’s shareholders’ meeting held on May 28, 2024,, granted to certain employees of the Group and members of the Executive Board 1,241,005 stock options, each giving its holder the right to subscribe one ordinary share, each with a par value of €0.03 and at a price of €2.97 (share premium included). Such stock options are governed by the 2025 Stock Option Plan. The ordinary stock options are exercisable as follows: ▪up to one-third of the ordinary stock options as from May 16, 2026; ▪ an additional one-third of the ordinary stock options as from May 16, 2027, ▪ the balance, i.e., one-third of the ordinary stock options as from May 16, 2028, subject to, for each increment, a continued service condition, and in any case, no later than 10 years after the date of grant, it being specified that stock options which have not been exercised by the end of this 10-year period will be forfeited by law. Free Shares No free shares were granted in the first half of 2025. As of June 30, 2025, the assumptions related to the estimated vesting of the founders’ warrants, the warrants and performance stock options have been updated (See Note 18 Share-based payments).

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- Definition The entire disclosure for share capital, reserves and other equity interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph B10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10&doctype=Appendix&subtype=B -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 160 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_160&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 79 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79&doctype=Standard -URIDate 2025-03-27 + Details
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