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Shareholders' equity - Changes in share capital (Details)
€ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 19, 2024
EUR (€)
€ / shares
shares
Dec. 16, 2024
EUR (€)
€ / shares
shares
Oct. 17, 2024
EUR (€)
€ / shares
shares
Mar. 25, 2024
EUR (€)
€ / shares
shares
Dec. 08, 2023
EUR (€)
€ / shares
shares
Sep. 05, 2023
€ / shares
shares
Aug. 31, 2023
EUR (€)
€ / shares
shares
Aug. 30, 2023
EUR (€)
€ / shares
shares
Jun. 15, 2022
EUR (€)
€ / shares
shares
Jul. 15, 2020
USD ($)
Dec. 31, 2023
EUR (€)
€ / shares
shares
Dec. 31, 2024
EUR (€)
€ / shares
shares
Dec. 31, 2023
EUR (€)
€ / shares
shares
Dec. 31, 2022
EUR (€)
€ / shares
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
€ / shares
shares
Disclosure of classes of share capital [line items]                                
Shareholders' equity                     € (32,032,000) € (106,647,000) € (32,032,000) € 45,476,000   € 88,866,000
Number of shares outstanding | shares                       95,662,391        
Nominal value | € / shares                       € 0.01        
Issue of equity                       € 57,338,000 30,587,000 9,366,000    
Transaction costs                       (9,605,000) (2,511,000) (539,000)    
Gross proceeds | $                   $ 107.7            
ATM                                
Disclosure of classes of share capital [line items]                                
Issue of equity                 € 9,400,000              
Gross proceeds | $                             $ 31.9  
Number of shares issued during the period | shares                 1,260,618              
August 2023                                
Disclosure of classes of share capital [line items]                                
Nominal value | € / shares           € 0.01 € 0.01                  
Issue of equity             € 30,600,000                  
Transaction costs             (2,500,000)                  
Issue of equity net of transaction costs             € 28,000,000                  
Number of shares issued during the period | shares           9,618,638 9,618,638                  
Price per share | € / shares             € 3.18                  
Tranche I, phase I, 2024 Financing arrangement in three tranches                                
Disclosure of classes of share capital [line items]                                
Issue of equity     € 94,100,000                          
Tranche I, phase I, 2024 Financing arrangement in three tranches | T1 BSA Warrants                                
Disclosure of classes of share capital [line items]                                
Number of warrants issued | shares     35,399,481                          
Number of shares per warrant | shares     1                          
Number of shares callable by warrants | shares     35,399,481                          
Exercise price of warrant | € / shares     € 0.01                          
Prefunded exercise price of warrant | € / shares     1.34                          
Subscription price per warrant | € / shares     € 0.01                          
Tranche I, phase I, 2024 Financing arrangement in three tranches | T1 New Share                                
Disclosure of classes of share capital [line items]                                
Number of shares issued during the period | shares     34,600,507                          
Price per share | € / shares     € 1.35                          
Tranche I, phase II, 2024 Financing arrangement in three tranches                                
Disclosure of classes of share capital [line items]                                
Issue of equity € 21,400,000                              
Tranche I, phase II, 2024 Financing arrangement in three tranches | T1 bis BSA Warrants                                
Disclosure of classes of share capital [line items]                                
Number of warrants issued | shares 8,053,847                              
Number of shares per warrant | shares 1                              
Number of shares callable by warrants | shares 8,053,847                              
Exercise price of warrant | € / shares € 0.01                              
Prefunded exercise price of warrant | € / shares 1.34                              
Subscription price per warrant | € / shares € 0.01                              
Tranche I, phase II, 2024 Financing arrangement in three tranches | T1 New Share                                
Disclosure of classes of share capital [line items]                                
Number of shares issued during the period | shares 7,872,064                              
Price per share | € / shares € 1.35                              
AGA 2022                                
Disclosure of classes of share capital [line items]                                
Issue of equity                     3,630          
Share capital                                
Disclosure of classes of share capital [line items]                                
Shareholders' equity                     € 521,158 € 956,624 € 521,158 € 421,341   € 408,735
Number of shares outstanding | shares                     52,115,807 95,662,407 52,115,807 42,134,169   40,873,551
Nominal value | € / shares                     € 0.01 € 0.01 € 0.01 € 0.01   € 0.01
Issue of equity                       € 425,000 € 96,000 € 13,000    
Share capital | ATM                                
Disclosure of classes of share capital [line items]                                
Increase (decrease) in number of shares outstanding | shares                 1,260,618              
Nominal value | € / shares                 € 0.01              
Issue of equity                 € 12,606              
Share capital | August 2023                                
Disclosure of classes of share capital [line items]                                
Increase (decrease) in number of shares outstanding | shares               9,618,638                
Nominal value | € / shares               € 0.01                
Issue of equity               € 96,186                
Share capital | Tranche I, phase I, 2024 Financing arrangement in three tranches                                
Disclosure of classes of share capital [line items]                                
Increase (decrease) in number of shares outstanding | shares     34,600,507                          
Nominal value | € / shares     € 0.01                          
Issue of equity     € 346,005                          
Share capital | Tranche I, phase II, 2024 Financing arrangement in three tranches                                
Disclosure of classes of share capital [line items]                                
Increase (decrease) in number of shares outstanding | shares 7,872,064                              
Nominal value | € / shares € 0.01                              
Issue of equity € 78,721                              
Share capital | AGA 2023-2                                
Disclosure of classes of share capital [line items]                                
Increase (decrease) in number of shares outstanding | shares   712,632                            
Nominal value | € / shares   € 0.01                            
Issue of equity   € 7,126                            
Share capital | Bonus shares                                
Disclosure of classes of share capital [line items]                                
Increase (decrease) in number of shares outstanding | shares         363,000                      
Nominal value | € / shares         € 0.01                      
Issue of equity         € 3,630                      
Share capital | AGA 2021 & AGA 2021 bis                                
Disclosure of classes of share capital [line items]                                
Increase (decrease) in number of shares outstanding | shares       361,381                        
Nominal value | € / shares       € 0.01                        
Issue of equity       € 3,614                        
Premiums related to share capital                                
Disclosure of classes of share capital [line items]                                
Shareholders' equity                     € 201,862,263 249,159,597 201,862,263 173,885,665   € 165,071,565
Issue of equity                       56,913,000 30,491,000 9,354,000    
Transaction costs                       € (9,605,000) € (2,511,000) € (539,000)    
Premiums related to share capital | ATM                                
Disclosure of classes of share capital [line items]                                
Issue of equity                 9,353,504              
Transaction costs                 € (539,404)              
Premiums related to share capital | August 2023                                
Disclosure of classes of share capital [line items]                                
Issue of equity               30,491,082                
Transaction costs               € (2,510,855)                
Premiums related to share capital | Tranche I, phase I, 2024 Financing arrangement in three tranches                                
Disclosure of classes of share capital [line items]                                
Issue of equity     € 38,422,366                          
Premiums related to share capital | Tranche I, phase II, 2024 Financing arrangement in three tranches                                
Disclosure of classes of share capital [line items]                                
Issue of equity € 8,885,708                              
Premiums related to share capital | AGA 2023-2                                
Disclosure of classes of share capital [line items]                                
Transaction costs   € (7,126)                            
Premiums related to share capital | Bonus shares                                
Disclosure of classes of share capital [line items]                                
Transaction costs         € (3,630)                      
Premiums related to share capital | AGA 2021 & AGA 2021 bis                                
Disclosure of classes of share capital [line items]                                
Transaction costs       € (3,614)