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v3.25.3

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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