Analysis Of Income And Expense [Abstract]
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 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 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | ||||||||||
| Revenue [abstract] | ||||||||||
| Revenue from rendering of services | — | 
                                                350 349
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                473 336
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Revenue | — | 
                                                350 349
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                473 336
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Material income and expense [abstract] | ||||||||||
| Other finance cost | — | 
                                                3 587
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3 486
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Expenses by nature [abstract] | ||||||||||
| Services expense | — | — | — | — | — | — | — | — | — | — | 
| Professional fees expense | — | 
                                                191 153
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                226 689
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Classes of employee benefits expense [abstract] | ||||||||||
| Employee benefits expense | — | 
                                                159 792
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                243 705
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss [abstract] | ||||||||||
| Depreciation and amortisation expense [abstract] | ||||||||||
| Depreciation and amortisation expense | — | 
                                                5 250
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                4 919
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Impairment loss (reversal of impairment loss) recognised in profit or loss | — | 
                                                50 000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                107 500
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Other expenses, by nature | — | 
                                                16 716
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                18 516
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| 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] | ||||||||||
| Miscellaneous other comprehensive income [abstract] | ||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations and hedges of net investments in foreign operations [abstract] | ||||||||||
| Other comprehensive income, net of tax, exchange differences on translation of foreign operations | — | 
                                                141,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                602,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | 
| Comprehensive income, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                71 828
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                51,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                71 879
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 680
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                125 774
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                94,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Comprehensive income attributable to owners of parent, continuing and discontinued operations [abstract] | ||||||||||
| Comprehensive income, attributable to owners of parent | — | 
                                                72 020
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
                                                126 376
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — |