v3.25.3
Financial liabilities - Heights convertible notes (Details)
€ / shares in Units, € in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 30, 2025
EUR (€)
note
€ / shares
shares
Sep. 30, 2025
EUR (€)
Sep. 30, 2024
EUR (€)
Sep. 30, 2025
EUR (€)
scenario
shares
Sep. 30, 2024
EUR (€)
Dec. 31, 2024
EUR (€)
€ / shares
Jul. 23, 2025
note
Disclosure of detailed information about borrowings [line items]              
Day-one gain on recognition of financial liabilities   € 1,262 € 147 € 1,557 € 442    
Number of ordinary shares issued (in shares) | shares       14,482,230      
Volatility              
Disclosure of detailed information about borrowings [line items]              
Percentage of reasonably possible increase in unobservable input, liabilities           1.00%  
Ordinary share price (in euro per share)              
Disclosure of detailed information about borrowings [line items]              
Amount of reasonably possible increase in unobservable input, liabilities | € / shares           € 1  
Risk-free rate              
Disclosure of detailed information about borrowings [line items]              
Percentage of reasonably possible increase in unobservable input, liabilities           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%  
Heights convertible notes, tranche A              
Disclosure of detailed information about borrowings [line items]              
Number of probability-weighted scenarios | scenario       2      
Notional amount           € 35,000  
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           2  
Heights convertible notes, tranche A | Ordinary share price (in euro per share)              
Disclosure of detailed information about borrowings [line items]              
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets           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           (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           € (631)  
Heights convertible notes              
Disclosure of detailed information about borrowings [line items]              
Day-one gain on recognition of financial liabilities € 1,262     € 2,359      
Number of convertible notes converted | note 200           150
Notional amount € 21,900            
Number of ordinary shares issued (in shares) | shares 920,377            
Conversion of Kreos OCABSA and heights notes € 53,921     € 53,921      
Heights convertible notes | Ordinary shares              
Disclosure of detailed information about borrowings [line items]              
Borrowings, fixed conversion price (euro per share) | € / shares € 23.7674