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Financial liabilities - Heights convertible notes (Details)
12 Months Ended
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Aug. 24, 2023
EUR (€)
shares
€ / shares
Aug. 20, 2023
EUR (€)
installment
closing
shares
tranche
€ / shares
Jul. 30, 2021
EUR (€)
€ / shares
Dec. 31, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Dec. 31, 2022
EUR (€)
€ / shares
Jun. 21, 2024
€ / shares
Mar. 28, 2024
€ / shares
Nov. 02, 2023
€ / shares
Feb. 22, 2023
€ / shares
Sep. 07, 2022
€ / shares
Apr. 01, 2022
€ / shares
Dec. 31, 2021
€ / shares
Disclosure of detailed information about borrowings [line items]                              
Net proceeds from the issuance of convertible bond loans           € 0 € 55,841,000 € 0              
Equity issuance, subscripion price per share (in euro per share) | € / shares                       € 6.50 € 8.36    
Repayments of convertible loan notes     € 33,000,000     8,750,000 27,188,000 0              
Day-one gain on recognition of financial liabilities           € 590,000 € 212,000 € 0              
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%
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
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%
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%                
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                
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 2,000 18,000 239,000                        
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 39,000 352,000 1,069,000                        
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 (219,000) (366,000) (239,000)                        
Heights convertible notes, tranche A | Held to maturity / voluntary conversion 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 € (631,000) € (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, 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                      
Conversion option, maximum period prior to maturity date       5 days                      
Day-one gain on recognition of financial liabilities       € 2,359,000                      
Unrecognition day-one gain of financial liabilities           € 2,147,000 1,557,000                
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 the issuance of convertible bond loans     € 35,000,000                        
Number of convertible notes issued (in shares) | shares     350                        
Convertible loan notes, nominal value     € 100,000                        
Borrowings, fixed conversion price | € / 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 the issuance of convertible bond loans         € 25,000,000                    
Borrowings, interest rate         6.00%                    
Equity issuance, subscripion price per share (in euro per share) | € / shares         € 30.55                    
Repayments of convertible loan notes     € 25,102,000       € 25,000,000