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REVENUE - Schedule of Components of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue $ 36,213 $ 38,380 $ 110,909 $ 118,317
Service revenue        
Disaggregation of Revenue [Line Items]        
Revenue 34,112 36,290 104,356 111,691
Reimbursable expenses        
Disaggregation of Revenue [Line Items]        
Revenue 2,039 1,957 6,398 6,158
Non-controlling interests        
Disaggregation of Revenue [Line Items]        
Revenue $ 62 $ 133 $ 155 $ 468