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Basis of Presentation and Consolidation and Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance | $ 460 | $ 460 | $ 7,709 | $ 460
Common Class A | Direct Digital Management LLC |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Number of units exchanged (in shares) | 410,000 | 410,000 | 0 | 410,000

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