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Related Party Transactions (Details) - USD ($) $ in Thousands		3 Months Ended		5 Months Ended
	Jan. 01, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Related Party Transaction [Line Items]
Sublease rental income		$ 2,564	$ 2,805
Stagwell Subsidiary [Member] | Services Provided By Subisidiary [Member]
Related Party Transaction [Line Items]
Due to Related Parties		2,000		$ 2,000
Accounts Payable, Related Parties		101		101
Stagwell Subsidiary [Member] | Event Management Services
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction				456
Due from Related Parties		316		316
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		529		529
Due from (to) from related parties		$ 0		$ 0
Other Company [Member] | Board of Directors Chairman [Member]
Related Party Transaction [Line Items]
Sublease rental income	$ 65

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