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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |
Sublease rental income |  |  | $ 11,329 | $ 8,965 | $ 3,671 |
Stagwell Subsidiary [Member] | Services Provided By Subisidiary [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  | $ 2,000
Due to Related Parties |  |  | 1,200 |  |  | 1,200
Stagwell Subsidiary [Member] | Media Planning, Buying and Reporting [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | 56,700 |  |  |
Due from Related Parties |  |  | 110 |  |  | 110
Stagwell Subsidiary [Member] | Development of Advertising Technology [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  | 483 |  |  |
Due to Related Parties |  |  | 2 |  |  | 2
Stagwell Subsidiary [Member] | Audience and Brand Research, Concept Testing and Landscape [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 145 |  |  |  |  |
Due to Related Parties |  |  | 63 |  |  | 63
Stagwell Subsidiary [Member] | Event Management Services [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Due from Related Parties |  |  | $ 67 |  |  | $ 67
Forecast | Stagwell Subsidiary [Member] | Event Management Services [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 457 |  |  |  |

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