v3.25.2
Notes to the interim condensed consolidated statement of financial position - Long-term Derivatives (Details)
6 Months Ended 12 Months Ended
May 07, 2025
€ / shares
shares
May 02, 2025
€ / shares
shares
Dec. 11, 2024
EUR (€)
€ / shares
shares
Apr. 01, 2024
€ / shares
shares
Jan. 04, 2024
EUR (€)
€ / shares
shares
Nov. 28, 2022
EUR (€)
D
€ / shares
shares
Jul. 01, 2022
€ / shares
shares
Jun. 30, 2025
EUR (€)
D
€ / shares
shares
Dec. 31, 2024
EUR (€)
€ / shares
shares
Oct. 14, 2024
EUR (€)
Dec. 31, 2023
shares
Disclosure of detailed information about borrowings [line items]                      
Nominal value               € 0.01      
Maximum | Tranche II, 2024 Financing arrangement in three tranches                      
Disclosure of detailed information about borrowings [line items]                      
Structured Financing amount | €                   € 116,000,000  
T2 New Share | Tranche II, 2024 Financing arrangement in three tranches                      
Disclosure of detailed information about borrowings [line items]                      
Volatility     59.30%           58.30%    
Nominal value € 0.01                    
Price per share € 1.35                    
T2 New Share | If five day volume weighted average price more than €1.35 | Tranche II, 2024 Financing arrangement in three tranches                      
Disclosure of detailed information about borrowings [line items]                      
Call option strike price     € 1.35                
Call option, conversion ratio     1                
EIB Tranche A 2022                      
Disclosure of detailed information about borrowings [line items]                      
Number of BSA outstanding | shares           2,266,023   2,266,023 2,266,023    
Stock price           € 4.13   € 2.62 € 2.18    
Maturity (years)           12 years   9 years 4 months 24 days 9 years 10 months 24 days    
Volatility           68.00%   55.30% 58.30%    
Cap of the put option (k€) | €           € 25,000   € 25,000 € 25,000    
Fair Value (k€) | €           € 9,469,000   € 20,899,000 € 11,987,000    
Unit Fair value (€) | €           4.18   9.22 5.29    
Number of shares per instrument | shares           1   3.72 2.7    
EIB Tranche B 2024                      
Disclosure of detailed information about borrowings [line items]                      
Number of BSA outstanding | shares         3,144,654     3,144,654 3,144,654    
Stock price         € 4.12     € 2.62 € 2.18    
Maturity (years)         12 years     10 years 6 months 11 years    
Volatility         62.00%     55.30% 58.30%    
Cap of the put option (k€) | €         € 25,000     € 25,000 € 25,000    
Fair Value (k€) | €         € 11,809,000     € 21,352,000 € 12,328,000    
Unit Fair value (€) | €         3.76     6.79 3.92    
Number of shares per instrument | shares         1     2.94 2.13    
T2 BSA Prefunded Warrants                      
Disclosure of detailed information about borrowings [line items]                      
Price per share   € 1.35                  
Subscription price per warrant   € 1.34                  
T2 BSA Prefunded Warrants | Tranche II, 2024 Financing arrangement in three tranches                      
Disclosure of detailed information about borrowings [line items]                      
Maturity term of warrants     3 months 15 days           3 months    
Number of warrants issued | shares 43,437,036 43,437,036           43,437,036      
Stock price € 3.19   € 2.37           € 2.18    
Volatility     59.30%           58.30%    
Unit Fair value (€) 3.18   1.05           0.86    
Nominal value € 0.01                    
Aggregate gross proceed | €     € 58,639,998.6                
Price per share 1.35                    
Subscription price per warrant € 1.34                    
Number of shares per instrument | shares 1 1 1           1    
T2 BSA Prefunded Warrants | Maximum | Tranche II, 2024 Financing arrangement in three tranches                      
Disclosure of detailed information about borrowings [line items]                      
Exercise price of warrant     € 1.35                
BSA 2022 | EIB Tranche A 2022                      
Disclosure of detailed information about borrowings [line items]                      
Subscription price per warrant           € 0.01          
Number of warrants issued | shares           2,266,023          
Warrants, exercise price           € 4.02          
BSA 2024 [Member] | EIB Tranche B 2024                      
Disclosure of detailed information about borrowings [line items]                      
Subscription price per warrant       € 0.01              
Number of warrants issued | shares       3,144,654              
Warrants, exercise price       € 3.95              
Warrant agreement with the European Investment Bank                      
Disclosure of detailed information about borrowings [line items]                      
Maturity term of warrants             12 years        
Warrant agreement with the European Investment Bank | EIB Tranche A 2022                      
Disclosure of detailed information about borrowings [line items]                      
Exercise price of warrant                 € 4.02    
Number of shares per instrument | shares                     1.2
Warrant agreement with the European Investment Bank | EIB Tranche B 2024                      
Disclosure of detailed information about borrowings [line items]                      
Exercise price of warrant                 € 3.95    
Number of shares per instrument | shares                 2.13    
Warrant agreement with the European Investment Bank | Derivatives                      
Disclosure of detailed information about borrowings [line items]                      
Subscription price per warrant             € 0.01        
Threshold trading days of warrants | D           90   90      
Number of shares per instrument | shares             1        
Warrant agreement with the European Investment Bank | Derivatives | EIB Tranche A 2022                      
Disclosure of detailed information about borrowings [line items]                      
Exercise price of warrant           € 4.02          
Number of warrants issued | shares           2,266,023          
Maximum potential gross proceeds from exercise of warrants | €           € 9,100,000          
Transaction costs on issue of warrants | €           € 56,000,000          
Warrant agreement with the European Investment Bank | Derivatives | EIB Tranche B 2024                      
Disclosure of detailed information about borrowings [line items]                      
Exercise price of warrant         € 3.95            
Number of warrants issued | shares         3,144,654            
Maximum potential gross proceeds from exercise of warrants | €         € 12,400,000            
Transaction costs on issue of warrants | €         € 89,000,000            
Volatility | Warrant agreement with the European Investment Bank | Finance contract with EIB                      
Disclosure of detailed information about borrowings [line items]                      
Percentage of reasonably possible increase (decrease) in risk assumption               1.00%      
Impact of a 5% change | €               € 300,000      
Number of shares callable per warrant | Warrant agreement with the European Investment Bank | EIB Tranche A 2022                      
Disclosure of detailed information about borrowings [line items]                      
Percentage of reasonably possible increase (decrease) in risk assumption               15.00%      
Impact of a 5% change | €               € 3,500,000      
Number of shares callable per warrant | Warrant agreement with the European Investment Bank | EIB Tranche B 2024                      
Disclosure of detailed information about borrowings [line items]                      
Percentage of reasonably possible increase (decrease) in risk assumption               15.00%      
Impact of a 5% change | €               € 3,400,000