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] | |||||||||||||||
| Non-current 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
                                                    
                                                
                                             | — | — | — | — | — | 
| Current assets [abstract] | |||||||||||||||
| Trade and other current receivables | — | — | 
                                                54 511
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                87 558
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Current tax assets, current | — | — | 
                                                2 182
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                5 088
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Cash and cash equivalents | — | — | 
                                                14 931
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                2 341
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | 
                                                4 406
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | 
| Current assets | — | — | 
                                                69  442
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                89  899
                                                
                                                    
                                                        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] | |||||||||||||||
| Non-current liabilities [abstract] | |||||||||||||||
| Non-current provisions [abstract] | |||||||||||||||
| Non-current provisions for employee benefits | — | — | 
                                                1 555
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1 555
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Other non-current financial liabilities | — | — | 
                                                6  251
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Other non-current non-financial liabilities | — | — | 
                                                8 581
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                7 856
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-current liabilities | — | — | 
                                                17 423
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                14 434
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Current liabilities [abstract] | |||||||||||||||
| Trade and other current payables | — | — | 
                                                10 433
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                28 531
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Other current financial liabilities | — | — | 
                                                4 166
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Current liabilities | — | — | 
                                                47  420
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                95 857
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | 
| Equity and liabilities | — | — | 
                                                157 011
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                227  051
                                                
                                                    
                                                        SEK
                                                    
                                                
                                             | — | — | — | — | — |