REVENUE - Schedule of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 145,066	$ 153,120
Service revenue
Disaggregation of Revenue [Line Items]
Revenue	136,565	144,496
Reimbursable expenses
Disaggregation of Revenue [Line Items]
Revenue	8,273	8,039
Non-controlling interests
Disaggregation of Revenue [Line Items]
Revenue	$ 228	$ 585