Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept | As at 2022-12-31 | As at 2021-12-31 | As at 2020-12-31 | 
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in subsidiaries reported in separate financial statements | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Trade and other current receivables [abstract] | |||
| Current trade receivables | 
                                                219,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                3,564,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Other current receivables | 
                                                204,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                949,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Categories of non-current financial assets [abstract] | |||
| Non-current financial assets | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents | 
                                                4,489,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                2,540,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                5,388,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                35,334,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Miscellaneous current assets [abstract] | |||
| Current investments | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Current borrowings and current portion of non-current borrowings, by type [abstract] | |||
| Current loans received and current portion of non-current loans received | 
                                                -
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                42,466,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Trade and other current payables [abstract] | |||
| Current trade payables | 
                                                295,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                3,023,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Issued capital [abstract] | |||
| Issued capital | 
                                                7,437,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                7,437,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Retained earnings [abstract] | |||
| Retained earnings | 
                                                18,952,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                21,749,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Net assets (liabilities) [abstract] | |||
| Assets | 
                                                4,912,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                44,011,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Liabilities | 
                                                16,427,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                58,323,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Net current assets (liabilities) [abstract] | |||
| Current assets | 
                                                4,912,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                44,011,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Current liabilities | 
                                                16,427,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | 
                                                58,323,000
                                                
                                                    
                                                        USD
                                                    
                                                
                                             | — | 
| Assets less current liabilities [abstract] |