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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration and credit risk (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 USD ($) item | Jun. 30, 2024 item | Dec. 31, 2024 USD ($) item
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
FDIC, deposit at financial institutions | $ | $ 1,102,248 |  | $ 1,400,025
Supplier concentration risk | Publisher one |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Number of publishers | 1 |  |
Supplier concentration risk | Publisher two |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Number of publishers |  | 2 |
Accounts receivable | Credit concentration risk |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Number of advertisers | 3 |  | 4
Accounts receivable | Credit concentration risk | Advertiser one |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) | 30.50% |  | 23.10%
Accounts receivable | Credit concentration risk | Advertiser two |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) | 16.20% |  | 21.20%
Accounts receivable | Credit concentration risk | Advertiser three |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) |  |  | 15.80%
Accounts receivable | Credit concentration risk | Advertiser four |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) | 10.30% |  | 12.30%
Revenue | Customer concentration risk |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Number of publishers | 2 | 7 |
Revenue | Customer concentration risk | Publisher one |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) | 40.40% | 154.50% |
Revenue | Customer concentration risk | Publisher two |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) | 26.80% | 66.30% |
Revenue | Customer concentration risk | Publisher three |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) |  | 64.20% |
Revenue | Customer concentration risk | Publisher four |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) |  | 57.80% |
Revenue | Customer concentration risk | Publisher five |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) |  | 45.70% |
Revenue | Customer concentration risk | Publisher six |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) |  | 28.50% |
Revenue | Customer concentration risk | Publisher seven |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) |  | 17.40% |
Accounts payable | Supplier concentration risk |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Number of publishers | 1 |  | 1
Accounts payable | Supplier concentration risk | Publisher two |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) | 93.60% |  | 86.60%
Purchase | Supplier concentration risk | Publisher one |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) | 95.50% | 63.60% |
Purchase | Supplier concentration risk | Publisher two |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |
Concentration of risk (as a percent) |  | 29.40% |

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