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REVENUE - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue $ 178,453 $ 365,547
Revenue recognized when services are performed or assets are sold    
Disaggregation of Revenue [Line Items]    
Revenue 157,855 332,084
Revenue related to technology platforms and professional services    
Disaggregation of Revenue [Line Items]    
Revenue 14,043 17,178
Reimbursable expenses revenue    
Disaggregation of Revenue [Line Items]    
Revenue $ 6,555 $ 16,285