Basis of Presentation and Consolidation and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Dec. 31, 2023	Aug. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Tax Contingency [Line Items]
Valuation allowance	$ 0.5		$ 0.5	$ 0.0
Direct Digital Management LLC \| Common Class A
Income Tax Contingency [Line Items]
Number of units exchanged	410,000	100,000	410,000	100,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant