Basis of Presentation and Consolidation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Concentrations of credit risk
Contract liabilities	$ 558	$ 558		$ 507
Contract with customer, liability, revenue recognized		200	$ 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		$ 0	100
Deferred financing costs	3,718	3,718		4,238
Debt discount	494	494		1,671
Net loss		5,940	$ 3,819
Accumulated deficit	11,129	11,129		8,774
Cash and cash equivalents	1,789	1,789		1,445
Total long-term debt	41,212	41,212		41,212
Sell-side advertising
Concentrations of credit risk
Goodwill	1,200	1,200
Prepaid Expenses and Other Current Assets
Concentrations of credit risk
Deferred financing costs	100	100		100
Credit Facility 2021 | Lafayette Square
Concentrations of credit risk
Deferred financing costs	3,700	3,700		4,200
Debt discount	500	500		1,700
Credit Agreement | Revolving Credit Facility | Line of Credit
Concentrations of credit risk
Total long-term debt	$ 3,700	$ 3,700		$ 3,700
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)		26.00%
Three Customers | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)		39.00%
Three Customers | Accounts Receivable | Credit Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)				34.00%
One Customer | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)			68.00%
Two Customers | Accounts Receivable | Credit Concentration Risk
Concentrations of credit risk
Concentration risk (as a percent)		29.00%
Class A Common Stock | Direct Digital Management LLC
Concentrations of credit risk
Conversion of stock, shares converted (in shares)	70,000	70,000	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