v3.25.2
Significant events for the year ended December 31, 2024 and the six-month period ended June 30, 2025 and subsequent events - For the year ended 2024 (Details)
€ / shares in Units, € in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended 27 Months Ended 31 Months Ended 139 Months Ended
Jun. 21, 2025
EUR (€)
Nov. 19, 2024
USD ($)
Jul. 11, 2024
shares
Mar. 28, 2024
EUR (€)
Jun. 30, 2024
EUR (€)
Mar. 31, 2024
shares
Jun. 30, 2025
EUR (€)
€ / shares
Jun. 30, 2024
EUR (€)
May 31, 2025
plan
Jun. 30, 2025
EUR (€)
€ / shares
Jun. 30, 2024
EUR (€)
Sep. 30, 2024
shares
plan
Nov. 30, 2019
EUR (€)
Jun. 30, 2016
EUR (€)
Jun. 30, 2025
EUR (€)
€ / shares
Nov. 19, 2024
shares
€ / shares
Aug. 20, 2023
EUR (€)
€ / shares
Dec. 16, 2013
EUR (€)
Disclosure of detailed information about borrowings [line items]                                    
Number of free shares plans issued | plan                 6     7            
Proceeds from borrowings                             € 175,000      
Par value per share (in euro per share) | € / shares             € 0.01     € 0.01         € 0.01 € 0.01    
Subsidies             € 0 € 4,096   € 0 € 4,121              
Number of ADS per Ordinary Shares | shares                               1    
At-The-Market (ATM) Program                                    
Disclosure of detailed information about borrowings [line items]                                    
Expected proceeds from share issuance | $   $ 150,000                                
Expected proceeds from share issuance, shelf registration | $   $ 350,000                                
RNP-VIR conditional advance                                    
Disclosure of detailed information about borrowings [line items]                                    
Maximum drawdown capacity         € 6,300     6,300     6,300              
Proceeds from conditional advances                         € 4,032          
Proceeds from government grants                         € 1,123          
Repayment of excess conditional advances claimed         € 1,241                          
Percentage of conditional advances waived         60.00%                          
Conditional advances Bpifrance         € 2,945     2,945     2,945              
Subsidies         1,872                          
CARENA conditional advance                                    
Disclosure of detailed information about borrowings [line items]                                    
Maximum drawdown capacity                                   € 3,840
Proceeds from conditional advances         € 1,068                 € 2,187        
Percentage of conditional advances waived         60.00%                          
Conditional advances Bpifrance         € 3,255     € 3,255     € 3,255              
Subsidies         € 2,251                          
Kreos & Claret financing, tranche B                                    
Disclosure of detailed information about borrowings [line items]                                    
Proceeds from borrowings       € 25,000                            
Kreos & Claret financing, tranche C                                    
Disclosure of detailed information about borrowings [line items]                                    
Proceeds from borrowings € 25,000                                  
Kreos & Claret Financing, Tranche B and C                                    
Disclosure of detailed information about borrowings [line items]                                    
Borrowings, maximum borrowing capacity                                 € 25,000  
Par value per share (in euro per share) | € / shares                                 € 1.00  
AGA-2024                                    
Disclosure of detailed information about borrowings [line items]                                    
Number of instruments issued (in shares) | shares                       1,946,125            
AGA-2024 | Tranche 1                                    
Disclosure of detailed information about borrowings [line items]                                    
Vesting percentage                       50.00%            
Vesting period                       2 years            
AGA-2024 | Tranche 2                                    
Disclosure of detailed information about borrowings [line items]                                    
Vesting percentage                       25.00%            
Vesting period                       3 years            
AGA-2024 | Tranche 3                                    
Disclosure of detailed information about borrowings [line items]                                    
Vesting percentage                       25.00%            
Vesting period                       4 years            
AGA-2024-6                                    
Disclosure of detailed information about borrowings [line items]                                    
Number of instruments issued (in shares) | shares     20,000                              
BSA-2024-1                                    
Disclosure of detailed information about borrowings [line items]                                    
Number of instruments issued (in shares) | shares           77,820                        
Vesting percentage           25.00%                        
Vesting period           4 years