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Basis of Presentation and Consolidation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 14, 2025 USD ($)	Aug. 08, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment shares	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($)
Concentrations of credit risk
Number of operating segments | segment					2
Number of reportable segments | segment					2
Contract assets in prepaid expenses and other current assets			$ 300		$ 300		$ 0
Contract assets in prepaid expenses and other long-term assets			200		200		0
Amortized contract costs					100	$ 0
Contract liabilities			548		548		507
Contract with customer, liability, revenue recognized					500	400
Goodwill			6,520		6,520		6,520
Goodwill, impairment loss					0	0
Impairment, long-lived asset, held-for-use					$ 0	0
Guaranteed recovery from insurance (as a percent)					90.00%
Remittance, if full amount collected (as a percent)					10.00%
Provision for bad debts (as a percent)					10.00%
Provision for credit losses net of recoveries					$ 100	100
Net loss			5,000	$ 6,377	15,136	$ 13,338
Accumulated deficit			16,058		16,058		8,774
Cash and cash equivalents			871		871		$ 1,445
Sell-side advertising
Concentrations of credit risk
Goodwill			$ 1,200		$ 1,200
Lafayette Square | 2021 Credit Facility
Concentrations of credit risk
Conversion of debt		$ 25,000
Lafayette Square | 2021 Credit Facility | Subsequent Event
Concentrations of credit risk
Conversion of debt	$ 10,000
Accounts Payable | Supplier Concentration Risk | One Supplier
Concentrations of credit risk
Concentration risk (as a percent)							16.00%
Accounts Payable | Supplier Concentration Risk | Two Supplier
Concentrations of credit risk
Concentration risk (as a percent)					33.00%
Two Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)			30.00%		27.00%
Two Customers | Accounts Receivable | Credit Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)					33.00%
One Customer | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)				12.00%		52.00%
Three Customers | Accounts Receivable | Credit Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)							34.00%
Class A Common Stock | Direct Digital Management LLC
Concentrations of credit risk
Conversion of Class B to Class A Common Stock (in shares) | shares					1,292,500	0
Non-Compete Agreements
Concentrations of credit risk
Customer remaining life (in years)			5 years		5 years
Other Intangible Assets
Concentrations of credit risk
Customer remaining life (in years)			10 years		10 years

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