Analysis Of Income And Expense [Abstract]
| Concept | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||
| Revenue [abstract] | ||||||||||
| Revenue | — | 
                                                164,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                136,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Material income and expense [abstract] | ||||||||||
| Gains (losses) on disposals of non-current assets [abstract] | ||||||||||
| Losses on disposals of non-current assets | — | 
                                                185,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Gains (losses) on disposals of other non-current assets | — | 
                                                2 800
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Expenses by nature [abstract] | ||||||||||
| Raw materials and consumables used | — | 
                                                54,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                64,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Services expense | — | 
                                                173,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                438,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Classes of employee benefits expense [abstract] | ||||||||||
| Employee benefits expense | — | 
                                                132,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                106,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract] | ||||||||||
| Depreciation and amortisation expense [abstract] | ||||||||||
| Depreciation and amortisation expense | — | 
                                                74,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                100,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Other expenses, by nature | — | 
                                                427,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | — | — | — | 
                                                894,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | — | — | 
| Disclosure of attribution of expenses by nature to their function [text block] | — | — | — | — | — | — | — | — | — | — | 
| Disclosure of attribution of expenses by nature to their function [abstract] | ||||||||||
| Disclosure of attribution of expenses by nature to their function [line items] | ||||||||||
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                147,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                147,000
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                2 717
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             | 
                                                2 717
                                                
                                                    
                                                        BGN
                                                    
                                                
                                             |