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Business Combinations - Additional Information (Detail) kr in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 11, 2021 Employee | Dec. 31, 2021 SEK (kr) | Dec. 31, 2020 SEK (kr) | Nov. 01, 2020 SEK (kr) | Dec. 31, 2019 SEK (kr)
Acquisitions 2019-2021 [member] |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |
Cash flow effect pursuant to business combinations |  | kr 256,000 | kr 9,534,000 |  |
Goodwill recognised as of acquisition date |  | 677,000 | 7,108,000 |  | kr 199,000
Consideration transferred, acquisition-date fair value |  | kr 256,000 | kr 9,848,000 |  | kr 1,957,000
Cradlepoint [member] |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |
Date of acquisition |  | Nov. 01, 2020 | Nov. 01, 2020 |  |
Increase Adjustment to Goodwill Recognized On Acquisition Date |  | kr 480 |  |  |
Goodwill recognised as of acquisition date |  | 7,500 |  |  |
Increase Adjustment to Deferred Revenuses Recognized On Acquisition Date |  | 350 |  |  |
Decrease Adjustment to Intangibles Recognized On Acquisition Date |  | 130 |  |  |
Adjustment to Income Statement Towards Purchase Price Allocation Changes |  | kr 100 |  |  |
Consideration transferred, acquisition-date fair value |  |  |  | kr 9,500,000 |
Quortus [Member] |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |
Date of acquisition |  | Nov. 01, 2021 |  |  |
Number of Employees Acquired | Employee | 29 |  |  |  |
Divestments [Member] |  |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |  |
Cash flow effect pursuant to business combinations |  | kr 273,000 | kr 4,000 |  |

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