v3.25.2
Financial liabilities - Heights convertible notes (Details)
€ / shares in Units, € in Thousands
6 Months Ended 12 Months Ended
Jul. 30, 2025
EUR (€)
note
€ / shares
shares
Jun. 30, 2025
EUR (€)
scenario
€ / shares
Dec. 31, 2024
EUR (€)
€ / shares
Aug. 05, 2025
note
Jul. 23, 2025
note
Heights convertible notes | Major ordinary share transactions          
Disclosure of detailed information about borrowings [line items]          
Number of convertible notes converted | note 200     350 150
Notional amount € 21,900        
Number of ordinary shares issued (in shares) | shares 920,377        
Heights convertible notes | Ordinary shares | Major ordinary share transactions          
Disclosure of detailed information about borrowings [line items]          
Borrowings, fixed conversion price (euro per share) | € / shares € 23.7674        
Volatility          
Disclosure of detailed information about borrowings [line items]          
Percentage of reasonably possible increase in unobservable input, liabilities   1.00% 1.00%    
Share price          
Disclosure of detailed information about borrowings [line items]          
Amount of reasonably possible increase in unobservable input, liabilities | € / shares   € 1 € 1    
Risk-free rate          
Disclosure of detailed information about borrowings [line items]          
Percentage of reasonably possible increase in unobservable input, liabilities   1.00% 1.00%    
Held to maturity scenario probability          
Disclosure of detailed information about borrowings [line items]          
Percentage of reasonably possible increase in unobservable input, liabilities   10.00% 10.00%    
Heights convertible notes, tranche A          
Disclosure of detailed information about borrowings [line items]          
Number of probability-weighted scenarios | scenario   2      
Notional amount   € 35 € 35    
Heights convertible notes, tranche A | Volatility          
Disclosure of detailed information about borrowings [line items]          
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   6 2    
Heights convertible notes, tranche A | Share price          
Disclosure of detailed information about borrowings [line items]          
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   42 39    
Heights convertible notes, tranche A | Risk-free rate          
Disclosure of detailed information about borrowings [line items]          
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   (152) (219)    
Heights convertible notes, tranche A | Held to maturity scenario probability          
Disclosure of detailed information about borrowings [line items]          
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € (237) € (631)