v3.26.3
Company information - Combined transaction (Details)
€ / shares in Units, $ / shares in Units, € in Thousands, $ in Millions
6 Months Ended 12 Months Ended
Jul. 09, 2026
EUR (€)
€ / shares
shares
Jun. 12, 2026
EUR (€)
€ / shares
shares
Jun. 12, 2026
EUR (€)
€ / shares
shares
Jun. 05, 2026
$ / €
€ / shares
shares
Jun. 02, 2026
EUR (€)
€ / shares
shares
Jun. 02, 2026
USD ($)
$ / shares
shares
Jun. 01, 2026
EUR (€)
$ / €
Jun. 30, 2026
EUR (€)
$ / €
€ / shares
shares
Jun. 30, 2025
EUR (€)
$ / €
shares
Dec. 31, 2025
EUR (€)
$ / €
Jan. 23, 2026
€ / shares
Jan. 14, 2026
€ / shares
Jul. 18, 2024
EUR (€)
May 16, 2022
EUR (€)
Company information                            
Proceeds from issuance of shares               € 103,197 € 57,370          
Transaction costs related to capital increase               8,205 7,519          
Repayments of borrowings               51,491 € 1,791          
Interest payable               € 624   € 5,855        
Nominal value | € / shares               € 0.01            
Average exchange rate for the period | $ / €               1.1667 1.0927 1.13        
Issue of warrants               € (303) € 58,206          
Derivative financial liabilities               € 13,051   € 119,385        
Exchange rate at the end of period | $ / €               1.1394 1.172 1.175        
Equity offering                            
Company information                            
Number of shares issued during the period | shares       27,272,727       27,272,727            
Nominal value | € / shares       € 0.01                    
ADS                            
Company information                            
Number of ordinary shares represented by each ADS               1            
ADS | Equity offering                            
Company information                            
Number of shares issued during the period | shares         27,272,727 27,272,727                
Number of ordinary shares represented by each ADS         1                  
Price per share | (per share)         € 3.7781 $ 4.4                
Proceeds from issuance of shares         € 103,000 $ 120.0                
Transaction costs related to capital increase         7,800 9.1                
Net proceeds from issuing shares         95,300 $ 110.9                
Exchange rate at the end of period | $ / €       1.164     1.1646              
T2 New Share | Tranche II, 2024 Financing arrangement in three tranches                            
Company information                            
Number of shares issued during the period | shares                 42,488,883          
Finance contract with EIB                            
Company information                            
Notional amount                           € 50,000
Repayments of borrowings   € 62,200                        
Catch-up adjustment to reflect the revised cash flow             € 5,000 € (5,000)            
Catch-up adjustment arising from unwinding of discount     € 500         (500)            
Finance contract with EIB, first tranche (Tranche A)                            
Company information                            
Financial liabilities at amortised cost             27,900     € 27,900        
Interest payable             2,900              
Finance contract with EIB, second tranche (Tranche B)                            
Company information                            
Financial liabilities at amortised cost             23,100     17,400        
Interest payable             € 2,800              
T1 bis BSA Warrants | Tranche I, 2024 Financing arrangement in three tranches                            
Company information                            
Nominal value | € / shares                       € 0.01    
T2 BSA Prefunded Warrants | Tranche II, 2024 Financing arrangement in three tranches                            
Company information                            
Nominal value | € / shares                     € 0.01      
Number of warrants issued | shares                 43,437,036          
Lenders' warrants                            
Company information                            
Notional amount         9,500                  
Number of shares per warrant | shares   1 1                      
Losses on fair value variation               3,475            
Exercise price of warrant | € / shares   € 4.1559 € 4.1559                      
Derivative financial liabilities   € 3,800 € 3,800         3,500            
Lenders' warrants, Tranche A and B                            
Company information                            
Notional amount   € 6,750 6,750   6,750                  
Number of warrants issued | shares   1,624,196                        
Lenders' warrants, Tranche C                            
Company information                            
Notional amount   € 2,750 € 2,750   € 2,750                  
Number of warrants issued | shares   661,709                        
EIB warrants                            
Company information                            
Underlying shares | shares   22,700,000                        
Losses on fair value variation               40,700            
Warrant issued at aggregate repurchase price   € 50,000           50,000            
Aggregate carrying amount               0   119,400        
Amount of fair value of repurchase and cancelled                   € 74,000        
Fair value gains on derivatives               68,500            
EIB Warrants Tranche A                            
Company information                            
Amount of fair value of repurchase and cancelled               66,300            
EIB Warrants Tranche B                            
Company information                            
Warrants repurchased and cancelled | shares   700,000                        
Amount of fair value of repurchase and cancelled               € 13,700            
EIB Warrants Tranche B | Issuance of warrants                            
Company information                            
Warrants repurchased and cancelled | shares 2,444,654                          
Underlying shares | shares 15,700,000                          
New European Investment Bank Warrants                            
Company information                            
Number of shares per warrant | shares               1            
Exercise price of warrant | € / shares               € 0.01            
New European Investment Bank Warrants | Issuance of warrants                            
Company information                            
Number of warrants issued | shares 15,677,573                          
Number of shares per warrant | shares 1                          
Issue of warrants € 0                          
Exercise price of warrant | € / shares € 0.01                          
Subscription price per warrant | € / shares 0.01                          
Arrangement fee per warrant | € / shares € 0.01                          
2024 Royalty Certificates                            
Company information                            
Notional amount                         € 20,100