Statement Of Cash Flows [Abstract]
| Concept | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|
| Statement of cash flows [abstract] | ||
| Cash flows from (used in) operating activities [abstract] | ||
| Adjustments for finance income (cost) | 
                                                41,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                23,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Adjustments for decrease (increase) in trade and other receivables | 
                                                41,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                731,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Adjustments for increase (decrease) in trade and other payables | 
                                                65,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                162,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss | 
                                                899,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                24,633,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities [abstract] | ||
| Proceeds from issue of ordinary shares | 
                                                0
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             | 
                                                5,978,000
                                                
                                                    
                                                        EUR
                                                    
                                                
                                             |