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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Contract assets and liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Contract assets:    
Unbilled receivables $ 11,991 $ 12,597
Contract liabilities:    
Customer advances and unearned income 2,966 6,123
Reserve for audience deficiency 12,925 9,629
Unearned event income $ 9,412 $ 5,708