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REVENUE - Schedule of Components of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Revenue $ 39,461 $ 39,516
Service revenue    
Disaggregation of Revenue [Line Items]    
Revenue 37,071 37,763
Reimbursable expenses    
Disaggregation of Revenue [Line Items]    
Revenue 2,310 1,592
Non-controlling interests    
Disaggregation of Revenue [Line Items]    
Revenue $ 80 $ 161