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Financial liabilities - Kreos 1 (Details)
€ / shares in Units, € in Thousands
1 Months Ended 12 Months Ended
Aug. 24, 2023
EUR (€)
€ / shares
Aug. 21, 2023
EUR (€)
Aug. 20, 2023
EUR (€)
€ / shares
May 24, 2023
EUR (€)
shares
Dec. 31, 2022
EUR (€)
€ / shares
shares
Dec. 31, 2021
EUR (€)
€ / shares
Jul. 24, 2018
EUR (€)
installment
tranche
€ / shares
shares
Oct. 31, 2020
EUR (€)
shares
Dec. 31, 2024
EUR (€)
€ / shares
shares
Dec. 31, 2023
EUR (€)
€ / shares
shares
Dec. 31, 2022
EUR (€)
€ / shares
shares
Jun. 21, 2024
€ / shares
Mar. 28, 2024
€ / shares
Nov. 02, 2023
€ / shares
Aug. 22, 2023
shares
Apr. 01, 2022
€ / shares
Oct. 13, 2020
installment
Disclosure of detailed information about borrowings [line items]                                  
Net proceeds from the issuance of convertible bond loans                 € 0 € 55,841 € 0            
Exercises of share warrants (in shares) | shares               464,309 4,000   19,134            
Borrowings, number of monthly installments | installment             54                   36
Other share warrants, subscripion price per share (in euro per share) | € / shares         € 0.14           € 0.14            
Repayments of convertible loan notes € 33,000               € 8,750 27,188 € 0            
Derivative financial liabilities         € 566 € 9,932     4,786 € 2,579 566            
Exercises of share warrants       € 1,850         € 45   € 3            
Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Exercises of share warrants       € 1,850                          
Volatility                                  
Disclosure of detailed information about borrowings [line items]                                  
Percentage of reasonably possible increase in unobservable input, liabilities 1.00%   1.00%   1.00% 1.00%     1.00% 1.00% 1.00% 1.00% 1.00% 1.00%   1.00%  
Volatility | Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets     € 48   € 6 € 16                      
Share price                                  
Disclosure of detailed information about borrowings [line items]                                  
Amount of reasonably possible increase in unobservable input, liabilities | € / shares € 1   € 1   € 1 € 1     € 1 € 1 € 1 € 1 € 1 € 1   € 1  
Share price | Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets     € 197   € 78 € 176                      
Risk-free rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Percentage of reasonably possible increase in unobservable input, liabilities 1.00%   1.00%   1.00% 1.00%     1.00% 1.00% 1.00% 1.00% 1.00% 1.00%   1.00%  
Risk-free rate | Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets     € 64   € 12 € 69                      
Kreos A BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Number of outstanding warrants (in shares) | shares       110,957 110,957   110,957       110,957            
Exercise price, other equity instruments granted (in euro per share) | € / shares             € 7.21                    
Kreos B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Number of outstanding warrants (in shares) | shares       74,766 74,766   74,766       74,766            
Exercise price, other equity instruments granted (in euro per share) | € / shares             € 10.70                    
Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Number of outstanding warrants (in shares) | shares                 214,198 214,198         214,198    
Other share warrants, subscripion price per share (in euro per share) | € / shares             € 1                    
Number of shares subscribed per warrant (in shares) | shares             1                    
Borrowings, maturity term             10 years                    
Kreos 1                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, maximum borrowing capacity             € 20,000                    
Borrowings, number of tranches | tranche             2                    
Borrowings, maximum borrowing capacity per tranche             € 10,000                    
Borrowings, exit fee percentage             9.00%                    
Borrowings, notice period                 30 days                
Borrowings, annual discount rate             4.00%                    
Kreos 1 | Euribor                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, adjustment to interest rate basis             8.00%                    
Kreos 1 | Bottom of range | Euribor                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate basis             8.00%                    
Kreos 1 | Top of range | Euribor                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate basis             9.00%                    
Kreos 1, non-convertible bond loans                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, maximum borrowing capacity             € 16,000                    
Kreos 1, convertible bond loans                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, maximum borrowing capacity             € 4,000                    
Borrowings, exit fee percentage             9.00%                    
Borrowings, exit fee amount             € 900                    
Derivative financial liabilities             € 0                    
Kreos 1, convertible bond loans, tranche A                                  
Disclosure of detailed information about borrowings [line items]                                  
Net proceeds from the issuance of convertible bond loans               € 2,000                  
Exercises of share warrants (in shares) | shares       67,887                          
Borrowings maturity, deferral period             12 months                    
Number of other share warrants repurchased (in shares) | shares       43,070                          
Number of other share warrants converted (in shares) | shares       67,887                          
Kreos 1, convertible bond loans, tranche B                                  
Disclosure of detailed information about borrowings [line items]                                  
Net proceeds from the issuance of convertible bond loans               € 2,000                  
Exercises of share warrants (in shares) | shares       31,696                          
Borrowings maturity, deferral period             6 months                    
Repayments of convertible loan notes € 8,000 € 7,661                              
Number of other share warrants repurchased (in shares) | shares       43,070                          
Number of other share warrants converted (in shares) | shares       31,696                          
Kreos 1 & 2 bond loans                                  
Disclosure of detailed information about borrowings [line items]                                  
Loss of extinguishment                 € 170