SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract assets and liabilities (Details) - Barter Transactions - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total barter assets	$ 2,101	$ 2,016
Total deferred barter revenue	2,101	2,016
Short-term
Disaggregation of Revenue [Line Items]
Total barter assets	1,688	1,848
Total deferred barter revenue	1,688	1,848
Long-term
Disaggregation of Revenue [Line Items]
Total barter assets	413	168
Total deferred barter revenue	$ 413	$ 168