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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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