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NET REVENUES - Contract assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Contract assets:    
Unbilled receivables $ 4,706 $ 5,437
Contract liabilities:    
Customer advances and unearned income 4,137 4,851
Reserve for audience deficiency 18,608 12,779
Unearned event income $ 338 $ 4,864