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NET REVENUE - Contract assets and liabilities (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Contract assets:    
Unbilled receivables $ 4,107 $ 5,969
Contract liabilities:    
Customer advances and unearned income 2,798 2,200
Reserve for audience deficiency 15,228 22,383
Unearned event income $ 6,937 $ 1,152