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Financial liabilities - Heights convertible notes (Details)
12 Months Ended
Jul. 30, 2025
EUR (€)
note
€ / shares
shares
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Aug. 24, 2023
EUR (€)
shares
€ / shares
Aug. 20, 2023
EUR (€)
installment
shares
tranche
closing
€ / shares
Jul. 30, 2021
EUR (€)
€ / shares
Dec. 31, 2025
EUR (€)
scenario
€ / shares
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Jul. 23, 2025
note
Jun. 21, 2024
€ / shares
Mar. 28, 2024
€ / shares
Nov. 02, 2023
€ / shares
Feb. 22, 2023
€ / shares
Disclosure of detailed information about borrowings [line items]                            
Net proceeds from convertible loan notes                 € 55,841,000          
Equity issuance, subscripion price per share (in euro per share) | € / shares                           € 6.50
Repayments of convertible loan notes       € 33,000,000     € 2,188,000 € 8,750,000 27,188,000          
Day-one gain on recognition of financial liabilities             1,557,000 590,000 212,000          
Losses on financial liabilities             € (36,015,000) (1,367,000) 0          
Heights convertible notes, tranche A                            
Disclosure of detailed information about borrowings [line items]                            
Notional amount   € 35,000,000 € 35,000,000,000 € 35,000,000       € 35,000,000 € 35,000,000,000          
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%  
Volatility | Heights convertible notes, tranche A                            
Disclosure of detailed information about borrowings [line items]                            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € 2,000 € 18,000 € 239,000                    
Ordinary share price (in euro per share)                            
Disclosure of detailed information about borrowings [line items]                            
Amount of reasonably possible increase in unobservable input, liabilities (in euro per share) | € / shares   € 1 € 1 € 1 € 1   € 1 € 1 € 1   € 1 € 1 € 1  
Ordinary share price (in euro per share) | Heights convertible notes, tranche A                            
Disclosure of detailed information about borrowings [line items]                            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € 39,000 € 352,000 € 1,069,000                    
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%  
Risk-free rate | Heights convertible notes, tranche A                            
Disclosure of detailed information about borrowings [line items]                            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € (219,000) € (366,000) € (239,000)                    
Held to maturity / voluntary conversion scenario probability                            
Disclosure of detailed information about borrowings [line items]                            
Percentage of reasonably possible increase in unobservable input, liabilities   10.00% 1.00% 1.00%       10.00% 1.00%          
Held to maturity / voluntary conversion scenario probability | Heights convertible notes, tranche A                            
Disclosure of detailed information about borrowings [line items]                            
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets   € (631,000) € (364,000) € (80,000)                    
Heights convertible notes                            
Disclosure of detailed information about borrowings [line items]                            
Borrowings, maximum borrowing capacity         € 75,000,000                  
Borrowings, number of tranches | tranche         2                  
Convertible loan notes, nominal value         € 100,000                  
Borrowings, fixed conversion price (in euro per share) | € / shares € 23.7674                          
Notional amount € 21,900,000                          
Borrowings, interest rate         6.00%                  
Borrowings, number of quarterly installments | installment         16                  
Borrowings maturity, deferral period         3 months                  
Borrowings, percentage of market price         90.00%                  
Borrowings, market price, number of days with lowest daily VWAP         2 days                  
Borrowings, market price, number of trading days         5 days                  
Equity issuance, subscripion price per share (in euro per share) | € / shares         € 14.4303                  
Number of convertible notes converted | note 200                 150        
Increase (decrease) in number of ordinary shares issued (in shares) | shares 920,377                          
Day-one gain on recognition of financial liabilities € 1,262,000       € 2,359,000                  
Unrecognition day-one gain of financial liabilities               € 1,557,000 € 2,147,000          
Number of probability-weighted scenarios | scenario             2              
Increase (decrease) through conversion of convertible instruments, equity € 53,921,000           € 53,921,000              
Conversion option, maximum period prior to maturity date         5 days                  
Losses on financial liabilities             € 36,015,000              
Heights convertible notes | Minimum                            
Disclosure of detailed information about borrowings [line items]                            
Issuance price, percentage of discount to 15-day WVAP         15.00%                  
Early redemption amount, percentage of outstandong principal         120.00%                  
Heights convertible notes | Maximum                            
Disclosure of detailed information about borrowings [line items]                            
Equity issuance, subscripion price per share (in euro per share) | € / shares         € 14.4303                  
Settlement in shares, percentage of fair market value         90.00%                  
Equity issuance, cash carve-out         € 13,125,000                  
Heights convertible notes, tranche A                            
Disclosure of detailed information about borrowings [line items]                            
Net proceeds from convertible loan notes       € 35,000,000                    
Number of convertible notes issued (in shares) | shares       350                    
Convertible loan notes, nominal value       € 100,000                    
Borrowings, fixed conversion price (in euro per share) | € / shares       € 23.7674                    
Exercise price, percentage of premium       40.00%                    
Heights convertible notes, tranche B                            
Disclosure of detailed information about borrowings [line items]                            
Number of convertible notes issued (in shares) | shares         400                  
Convertible loan notes, nominal value         € 100,000                  
Notional amount         € 40,000,000                  
Exercise price, percentage of 15-day WVAP         130.00%                  
Heights convertible notes, tranche B | Minimum                            
Disclosure of detailed information about borrowings [line items]                            
Convertible loan notes, period         3 months                  
Convertible loan notes, number of separate closings | closing         2                  
Heights convertible notes, tranche B | Maximum                            
Disclosure of detailed information about borrowings [line items]                            
Convertible loan notes, period         1 year                  
OCEANE                            
Disclosure of detailed information about borrowings [line items]                            
Net proceeds from convertible loan notes           € 25,000,000                
Equity issuance, subscripion price per share (in euro per share) | € / shares           € 30.55                
Repayments of convertible loan notes       € 25,102,000         € 25,000,000