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Intangible assets - Disclosure of reconciliation of intangible assets (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | € 6,604 | [1] | € 6,607 | [1] | € 93 |
Intangible assets other than goodwill at end of period | 6,606 |  | 6,604 | [1] | 6,607 | [1]
LICENCES |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 75 |  | 75 |  | 85 |
Intangible assets other than goodwill at end of period | 75 |  | 75 |  | 75 |
SOFTWARES |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 0 |  | 3 |  | 8 |
Intangible assets other than goodwill at end of period | 3 |  | 0 |  | 3 |
PATENTS |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 6,529 |  | 6,529 |  | 0 |
Intangible assets other than goodwill at end of period | 6,529 |  | 6,529 |  | 6,529 |
GROSS VALUES |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 6,673 |  | 6,673 |  | 110 |
Acquisition | 3 |  | 0 |  | 6,564 |
Intangible assets other than goodwill at end of period | 6,677 |  | 6,673 |  | 6,673 |
GROSS VALUES | LICENCES |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 120 |  | 120 |  | 85 |
Acquisition | 0 |  | 0 |  | 35 |
Intangible assets other than goodwill at end of period | 120 |  | 120 |  | 120 |
GROSS VALUES | SOFTWARES |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 24 |  | 24 |  | 24 |
Acquisition | 3 |  | 0 |  | 0 |
Intangible assets other than goodwill at end of period | 27 |  | 24 |  | 24 |
GROSS VALUES | PATENTS |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 6,529 |  | 6,529 |  |  |
Acquisition | 0 |  | 0 |  | 6,529 |
Intangible assets other than goodwill at end of period | 6,529 |  | 6,529 |  | 6,529 |
AMORTIZATION |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | (69) |  | (66) |  | (17) |
Increase | (1) |  | (2) |  | (4) |
Impairment |  |  |  |  | (45) |
Intangible assets other than goodwill at end of period | (70) |  | (69) |  | (66) |
AMORTIZATION | LICENCES |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | (45) |  | (45) |  | 0 |
Increase | 0 |  | 0 |  | 0 |
Impairment |  |  |  |  | (45) |
Intangible assets other than goodwill at end of period | (45) |  | (45) |  | (45) |
AMORTIZATION | SOFTWARES |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | (24) |  | (21) |  | (17) |
Increase | (1) |  | (3) |  | (4) |
Impairment |  |  |  |  | 0 |
Intangible assets other than goodwill at end of period | (25) |  | (24) |  | (21) |
AMORTIZATION | PATENTS |  |  |  |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |  |  |  |
Intangible assets other than goodwill at beginning of period | 0 |  | 0 |  | 0 |
Increase | 0 |  | 0 |  | 0 |
Impairment |  |  |  |  | 0 |
Intangible assets other than goodwill at end of period | € 0 |  | € 0 |  | € 0 |
[1] | 1 In application of the Amendments to IAS 1 Presentation of Financial Statements – Classification of Liabilities as Current or Non-current, and Non-current Liabilities with Covenants, the non-current portion of the OCEANE bonds as of December 31, 2022, amounting to €19,332 thousand, and the non-current portion of the Heights convertible notes as of December 31, 2023, amounting to €20,652 thousand, were reclassified within the current liabilities (Convertible loan notes) as of December 31, 2022 and 2023 respectively (see Note 2).

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