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Related Party Transactions (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | May 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | May 31, 2021 | Apr. 30, 2021 | Feb. 28, 2021 | Jan. 31, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sublease rental income |  |  | $ 2,311 | $ 2,892 |  | $ 4,875 | $ 5,697 |  |  |  |
Stagwell Subsidiary [Member] | Services Provided By Subisidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due to Related Parties |  |  |  |  | $ 2,000 |  |  |  |  |  |
Accounts Payable, Related Parties |  |  | 22 |  |  | 22 |  |  |  |  |
Stagwell Subsidiary [Member] | Event Management Services |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  | 456 |  |  |  |  |  |
Due from Related Parties |  |  | 0 |  |  | 0 |  |  |  |  |
Affiliated Entity [Member] | Arrangement To Perform Specialized Digital Strategy, User Experience Design, Analytics, And Reporting |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due to Related Parties |  |  |  |  |  |  |  |  | $ 1,123 |  |
Due from (to) from related parties |  |  | (659) |  |  | (659) |  |  |  |  |
Affiliated Entity [Member] | Arrangement To Perform Website Design And Development Services |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due to Related Parties |  |  |  |  |  |  |  | $ 708 |  |  |
Due from (to) from related parties |  |  | 0 |  |  | 0 |  |  |  |  |
Stagwell Affiliate [Member] | Affiliated Entity [Member] | Arrangement To Perform Programmatic Media, Planning, Buying And Reporting Services |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 2,397 |  |  |  |  |  |  |  |  |
Due from (to) from related parties |  |  | 582 |  |  | 582 |  |  |  |  |
Stagwell Affiliate [Member] | Affiliated Entity [Member] | Arrangement To Perform Media Buying Services |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  | 1,060 |  |  |  |  |
Due from (to) from related parties |  |  | 0 |  |  | 0 |  |  |  |  |
Stagwell Affiliate [Member] | Affiliated Entity [Member] | Arrangement To Perform Media, Planning, Buying And Reporting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, related parties, current |  |  |  |  |  |  |  |  |  |  | $ 6,429
Stagwell Affiliate [Member] | Affiliated Entity [Member] | Arrangement To Perform Gathering And Concept Features |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due from (to) from related parties |  |  | 140 |  |  | 140 |  |  |  |  |
Accounts receivable, related parties, current |  |  |  |  |  |  |  |  |  | $ 140 |
Stagwell Affiliate [Member] | Affiliated Entity [Member] | Arrangement To Perform Media Relations Support And Outreach Services |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due from (to) from related parties |  |  | 180 |  |  | 180 |  |  |  |  |
Accounts receivable, related parties, current |  |  |  |  | $ 190 |  |  |  |  |  |
Stagwell Affiliate [Member] | Chief Executive Officer | Arrangement To Perform Media, Planning, Buying And Reporting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due from (to) from related parties |  |  | 0 |  |  | 0 |  |  |  |  |
Accounts receivable, related parties, current |  |  | 884 |  |  | 884 |  |  |  |  |
Stagwell Affiliate [Member] | Partner Firm | Arrangement To Perform Media, Planning, Buying And Reporting Services [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due from (to) from related parties |  |  | $ 434 |  |  | $ 434 |  |  |  |  |
Accounts receivable, related parties, current |  |  |  |  |  |  |  |  | $ 3,291 |  |
Other Company [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sublease rental income | $ 8 |  |  |  |  |  |  |  |  |  |

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