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Intangible assets - Disclosure of reconciliation of intangible assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
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] 1In 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).