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Shareholders' equity - Movements in BSPCE and BSA share warrants (Details)
€ / shares in Units, € in Thousands
12 Months Ended
Dec. 15, 2023
EquityInstruments
€ / shares
May 25, 2023
EquityInstruments
€ / shares
Apr. 16, 2021
EquityInstruments
€ / shares
Mar. 09, 2020
EquityInstruments
€ / shares
Jun. 28, 2019
EquityInstruments
€ / shares
Dec. 14, 2018
EquityInstruments
€ / shares
May 29, 2017
EquityInstruments
€ / shares
Dec. 31, 2024
EquityInstruments
€ / shares
shares
Dec. 31, 2024
EUR (€)
EquityInstruments
€ / shares
shares
Dec. 31, 2024
EquityInstruments
€ / shares
shares
Dec. 31, 2023
EquityInstruments
€ / shares
shares
Dec. 31, 2023
EUR (€)
EquityInstruments
€ / shares
shares
Dec. 31, 2023
EquityInstruments
€ / shares
shares
Dec. 31, 2022
EquityInstruments
€ / shares
shares
Dec. 31, 2022
EquityInstruments
€ / shares
shares
BSPCE and BSA Share Warrants                              
Notes to the interim condensed consolidated statement of financial position                              
Outstanding, Beginning balance               776,333     806,800     930,800  
Issued                     30,000        
Forfeited/ Lapsed                     (60,467)     (124,000)  
Outstanding, Ending balance               776,333     776,333     806,800  
Number of exercisable shares               746,333 746,333 746,333 732,000 732,000 732,000 298,800 298,800
Number of shares callable by warrants | shares                           806,800 806,800
Expense from share-based payment transactions | €                 € 236     € 827      
BSPCE plans                              
Notes to the interim condensed consolidated statement of financial position                              
Outstanding, Beginning balance               430,000     488,800     608,800  
Forfeited/ Lapsed                     (58,800)     (120,000)  
Outstanding, Ending balance               430,000     430,000     488,800  
Number of exercisable shares               430,000 430,000 430,000 430,000 430,000 430,000 8,800 8,800
Number of shares callable by warrants | shares               430,000 430,000 430,000 430,000 430,000 430,000 488,800 488,800
BSPCE - 2013 Plan                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares                     € 0.59 € 0.59 € 0.59 € 0.59 € 0.59
Outstanding, Beginning balance                     8,800     8,800  
Forfeited/ Lapsed                     (8,800)        
Outstanding, Ending balance                           8,800  
Number of exercisable shares                           8,800 8,800
Number of other equity instruments expired in share-based payment arrangement                     8,800        
BSPCE 2021                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares     € 11.74         € 11.74 € 11.74 € 11.74 € 11.74 € 11.74 € 11.74 € 11.74 € 11.74
Outstanding, Beginning balance               430,000     480,000     600,000  
Issued     600,000                        
Forfeited/ Lapsed                     (50,000)     (120,000)  
Outstanding, Ending balance               430,000     430,000     480,000  
Number of exercisable shares               430,000 430,000 430,000 430,000 430,000 430,000    
BSPCE 2021 | Based On Market Condition                              
Notes to the interim condensed consolidated statement of financial position                              
Forfeited/ Lapsed                     (30,000)        
BSPCE 2021 | Based On Non-Market Condition                              
Notes to the interim condensed consolidated statement of financial position                              
Forfeited/ Lapsed                     (20,000)        
BSA plans                              
Notes to the interim condensed consolidated statement of financial position                              
Outstanding, Beginning balance               346,333     318,000     322,000  
Issued                     30,000        
Forfeited/ Lapsed                     (1,667)     (4,000)  
Outstanding, Ending balance               346,333     346,333     318,000  
Number of exercisable shares               316,333 316,333 316,333 302,000 302,000 302,000 290,000 290,000
Number of shares callable by warrants | shares               776,333 776,333 776,333 776,333 776,333 776,333    
BSA - 2017 plan                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares             € 6.675 € 6.67 € 6.67 € 6.67 € 6.67 € 6.67 € 6.67 € 6.67 € 6.67
Outstanding, Beginning balance               130,000     130,000     130,000  
Issued             195,000                
Outstanding, Ending balance               130,000     130,000     130,000  
Number of exercisable shares               130,000 130,000 130,000 130,000 130,000 130,000 130,000 130,000
BSA - 2018 plan                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares           € 6.067   € 6.07 € 6.07 € 6.07 € 6.07 € 6.07 € 6.07 € 6.07 € 6.07
Outstanding, Beginning balance               116,000     116,000     116,000  
Issued           126,000                  
Outstanding, Ending balance               116,000     116,000     116,000  
Number of exercisable shares               116,000 116,000 116,000 116,000 116,000 116,000 116,000 116,000
BSA - 2019 plan                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares         € 2.2     € 2.2 € 2.2 € 2.2 € 2.2 € 2.2 € 2.2 € 2.2 € 2.2
Outstanding, Beginning balance               10,000     10,000     10,000  
Issued         10,000                    
Outstanding, Ending balance               10,000     10,000     10,000  
Number of exercisable shares               10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000
BSA 2019 bis                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares       € 3.68       € 3.68 € 3.68 € 3.68 € 3.68 € 3.68 € 3.68 € 3.68 € 3.68
Outstanding, Beginning balance               10,000     10,000     10,000  
Issued       10,000                      
Outstanding, Ending balance               10,000     10,000     10,000  
Number of exercisable shares               10,000 10,000 10,000 10,000 10,000 10,000 10,000 10,000
BSA 2019 ter                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares       € 3.68       € 3.68 € 3.68 € 3.68 € 3.68 € 3.68 € 3.68 € 3.68 € 3.68
Outstanding, Beginning balance               36,000     36,000     36,000  
Issued       36,000                      
Outstanding, Ending balance               36,000     36,000     36,000  
Number of exercisable shares               36,000 36,000 36,000 36,000 36,000 36,000 24,000 24,000
BSA 2021                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares     € 11.74                        
Issued     50,000                        
BSA 2023-1                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares   € 2.51           € 2.51 € 2.51 € 2.51 € 2.51 € 2.51 € 2.51    
Outstanding, Beginning balance               10,000              
Issued   10,000                 10,000        
Outstanding, Ending balance               10,000     10,000        
BSA 2023-1 | David Nikodem                              
Notes to the interim condensed consolidated statement of financial position                              
Issued   10,000                          
BSA- 2 2023 plan                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares € 3.91             € 3.91 3.91 3.91 € 3.91 3.91 3.91    
Outstanding, Beginning balance               20,000              
Issued 20,000                   20,000        
Outstanding, Ending balance               20,000     20,000        
BSA- 2 2023 plan | David Nikodem                              
Notes to the interim condensed consolidated statement of financial position                              
Issued 20,000                            
BSA - Plan 2021-1                              
Notes to the interim condensed consolidated statement of financial position                              
Exercise price (in euros) | € / shares               € 11.74 € 11.74 € 11.74 € 11.74 € 11.74 € 11.74 € 11.74 € 11.74
Outstanding, Beginning balance               14,333   14,333 16,000   16,000 20,000  
Forfeited/ Lapsed                         (1,667) (4,000)  
Outstanding, Ending balance               14,333     14,333   14,333 16,000 16,000
Number of exercisable shares               14,333 14,333 14,333          
BSA - Plan 2021-1 | Based On Non-Market Condition                              
Notes to the interim condensed consolidated statement of financial position                              
Forfeited/ Lapsed                     (1,667)