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Financial liabilities - Kreos / Claret Financing (Details)
€ / shares in Units, € in Thousands, $ in Thousands
12 Months Ended 121 Months Ended
Dec. 31, 2024
EUR (€)
€ / shares
Jun. 21, 2024
EUR (€)
€ / shares
Jun. 21, 2024
USD ($)
Mar. 28, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Nov. 02, 2023
EUR (€)
€ / shares
shares
Aug. 22, 2023
EUR (€)
Aug. 20, 2023
EUR (€)
tranche
€ / shares
shares
Dec. 31, 2022
EUR (€)
€ / shares
Dec. 31, 2021
EUR (€)
€ / shares
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Dec. 31, 2022
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Aug. 24, 2023
€ / shares
Apr. 01, 2022
€ / shares
Jul. 24, 2018
€ / shares
Disclosure of detailed information about borrowings [line items]                                  
Proceeds from borrowings                           € 175,000      
Other share warrants, subscripion price per share (in euro per share) | € / shares                 € 0.14       € 0.14        
Repayments of bond loans                     € 0 € 11,635 € 9,410        
Financial liabilities, at fair value € 162,256       € 125,191       € 58,469   € 162,256 € 125,191 € 58,469 € 125,191      
Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Financial liabilities, at fair value               € 23,995                  
Convertible loans notes               25,000                  
Carrying amount of the equity component               € 1,005                  
Market rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Percentage of reasonably possible increase in unobservable input, liabilities               1.00%                  
Market rate | Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Significant unobservable input, liabilities               0.126                  
Decrease in financial liabilities at fair value               € 624                  
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 € 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              
Share price | Kreos C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets           € 232                      
Share price | Kreos A & B & C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets € 350       € 401                        
Share price | Kreos & Claret minimum return indemnifications                                  
Disclosure of detailed information about borrowings [line items]                                  
Significant unobservable input, liabilities | € / shares   12.94   13.40                          
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € (16)   € (30)             € (3)            
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% 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              
Volatility | Kreos C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets           € 28                      
Volatility | Kreos A & B & C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets € 37       € 96                        
Volatility | Kreos & Claret minimum return indemnifications                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € 4   € 4             € (1)            
Volatility | Kreos & Claret minimum return indemnifications | Black Scholes Model                                  
Disclosure of detailed information about borrowings [line items]                                  
Significant unobservable input, liabilities   0.601   0.603                          
Volatility | Kreos & Claret minimum return indemnifications | Monte Carlo Model                                  
Disclosure of detailed information about borrowings [line items]                                  
Significant unobservable input, liabilities   0.599   0.619                          
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% 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              
Risk-free rate | Kreos C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets           € 42                      
Risk-free rate | Kreos A & B & C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets € 61       € 95                        
Risk-free rate | Kreos & Claret minimum return indemnifications                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € 8   € (3)             € (3)            
Risk-free rate | Kreos & Claret minimum return indemnifications | Black Scholes Model                                  
Disclosure of detailed information about borrowings [line items]                                  
Significant unobservable input, liabilities   0.030   0.026                          
Risk-free rate | Kreos & Claret minimum return indemnifications | Monte Carlo Model                                  
Disclosure of detailed information about borrowings [line items]                                  
Significant unobservable input, liabilities   0.031   0.028                          
Final redemption scenario probability                                  
Disclosure of detailed information about borrowings [line items]                                  
Percentage of reasonably possible increase in unobservable input, liabilities 10.00% 5.00%   5.00%             10.00%            
Final redemption scenario probability | Kreos & Claret minimum return indemnifications                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € 46   € 35             € 3            
Discount 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%            
Discount rate | Kreos & Claret minimum return indemnifications                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € (13)   € (53)             € (82)            
7-year expiry scenario probability                                  
Disclosure of detailed information about borrowings [line items]                                  
Percentage of reasonably possible increase in unobservable input, liabilities 10.00%       5.00% 5.00%   5.00%     10.00% 5.00%   5.00%      
7-year expiry scenario probability | 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                  
7-year expiry scenario probability | Kreos C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets           € 36                      
7-year expiry scenario probability | Kreos A & B & C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets € 75       € 76                        
Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Other share warrants, subscripion price per share (in euro per share) | € / shares                                 € 1
Expiry scenario period, other equity instruments granted               7 years     7 years            
Kreos C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Expiry scenario period, other equity instruments granted           7 years                      
Kreos A & B & C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Expiry scenario period, other equity instruments granted 7 years       7 years                        
Kreos & Claret financing                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, maximum borrowing capacity               € 75,000                  
Borrowings, number of tranches | tranche               3                  
Borrowings, maximum borrowing capacity per tranche               € 25,000                  
Other share warrants, exercise period               7 years                  
Kreos & Claret financing | Kreos A & B BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Other share warrants, subscripion price per share (in euro per share) | € / shares               € 1.00                  
Number of warrants granted (in shares) | shares               214,198                  
Exercise price, other equity instruments granted (in euro per share) | € / shares               € 18.6744                  
Exercise price, percentage of premium               10.00%                  
Kreos & Claret financing | Kreos C BSA                                  
Disclosure of detailed information about borrowings [line items]                                  
Number of warrants granted (in shares) | shares           405,832                      
Exercise price, other equity instruments granted (in euro per share) | € / shares           € 9.86                      
Exercise price, percentage of 15-day WVAP           110.00%                      
Issuance of other share warrants           € 4,000                      
Number of instruments granted, percentage exercisable immediately           50.00%                      
Number of instruments granted, remaining percentage exercisable           50.00%                      
Kreos & Claret financing, tranche A                                  
Disclosure of detailed information about borrowings [line items]                                  
Proceeds from borrowings             € 25,000                    
Borrowings, fixed conversion price | € / shares               € 21.2209                  
Borrowings, interest rate               9.00%                  
Borrowings, early repayment, discount rate               4.00%                  
Borrowings, exit fee percentage               8.00%                  
Kreos & Claret financing, tranche B and C                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, number of tranches | tranche               2                  
Borrowings, early repayment, discount rate               4.00%                  
Borrowings, exit fee percentage               6.00%                  
Kreos & Claret financing, tranche B and C | European Central Bank base rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, adjustment to interest rate basis 7.50%             7.50%     7.50%            
Kreos & Claret financing, tranche B and C | European Central Bank base rate | Bottom of range                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate basis 2.50%             2.50%     2.50%            
Kreos & Claret financing, tranche B and C | European Central Bank base rate | Top of range                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate basis 4.00%             4.00%     4.00%            
Kreos & Claret financing, tranche B                                  
Disclosure of detailed information about borrowings [line items]                                  
Proceeds from borrowings       € 25,000                          
Borrowings, debt-to-market capitalization ratio       10.00%                          
Kreos & Claret financing, tranche C                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, maximum borrowing capacity   € 25,000                              
Proceeds from borrowings       € 25,000                          
Borrowings, debt-to-market capitalization ratio   10.00%                              
Performance conditions, minimum financing | $     $ 125,000                            
Kreos 1 bond loans                                  
Disclosure of detailed information about borrowings [line items]                                  
Repayments of bond loans             € 7,661