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Assets Held for Sale and Divested Operations (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 06, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net proceeds received excluded Cash and cash equivalents and Restricted cash |  | $ 0 | $ 3,751 |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  | $ 18,431 |
Discontinued Operations, Disposed of by Sale | Brand Protection, AntiPiracy, and AntiFraud Solutions |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Purchase price |  |  |  |  |  | $ 3,751
Impairment of intangible assets |  |  | 17,967 |  |  |
Goodwill, impairment loss |  |  | $ 468 |  |  |
Goodwill written off |  |  |  | $ 9,129 |  |
Discontinued Operations, Disposed of by Sale | Techstreet Business |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Purchase price | $ 42,832 |  |  |  |  |
Consideration held in escrow | 4,300 |  |  |  |  |
Goodwill written off | 9,129 |  |  |  |  |
Net gain on sale | 28,140 |  |  |  |  |
Transaction costs | 115 |  |  |  |  |
Intangible Assets, Written off Related to Sale of Business Unit | $ 10,179 |  |  |  |  |

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