RELATED PARTY TRANSACTIONS - DMSH Member Tax Distributions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Related Party Transactions [Abstract]
Tax distributions to members	$ 0.2	$ 0.2

Related Party Tax Expense, Tax Distributions to Members

No definition available.

Name:	dms_RelatedPartyTaxExpenseTaxDistributionsToMembers
Namespace Prefix:	dms_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration