Statement Of Financial Position [Abstract]
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of financial position [abstract] | |||||||||||||||
| Assets [abstract] | |||||||||||||||
| Property, plant and equipment | — | — | 
                                                5  969
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                11  191
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Right-of-use assets | — | — | 
                                                5  969
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                10  906
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Goodwill | — | — | 
                                                69  260
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                119  260
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Deferred tax assets | — | — | 
                                                10 785
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                5 146
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Cash and cash equivalents | — | — | 
                                                14 931
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                2 341
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                4 406
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
| Assets | — | — | 
                                                157 011
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                227  051
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Equity and liabilities [abstract] | |||||||||||||||
| Equity [abstract] | |||||||||||||||
| Issued capital | — | — | 
                                                62 032
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                22 557
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Retained earnings | — | — | 
                                                36 234
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                162 008
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Equity attributable to owners of parent | — | — | 
                                                92  168
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                116  760
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Equity | 
                                                35 645
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                65 922
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                92 168
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                62 032
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                141,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                22 557
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                192,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                58 161
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                36 234
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                116 760
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                242 440
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                22 557
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                286,000
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                162 008
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                58 161
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
| Liabilities [abstract] | |||||||||||||||
| Current tax liabilities | — | — | 
                                                3 590
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Equity and liabilities | — | — | 
                                                157 011
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                227  051
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — |