REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenue (Details) - USD ($) $ in Thousands	7 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 03, 2019	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 80,415	$ 140,738	$ 337,596	$ 282,914
Supplemental Benefit Services
Disaggregation of Revenue [Line Items]
Net revenues	29,262	48,293	160,021	135,723
Health Plan Management
Disaggregation of Revenue [Line Items]
Net revenues	25,571	45,245	93,150	76,814
Consulting Services
Disaggregation of Revenue [Line Items]
Net revenues	15,586	32,359	58,872	46,332
Software Services
Disaggregation of Revenue [Line Items]
Net revenues	5,384	6,366	13,894	13,365
Data Analytics
Disaggregation of Revenue [Line Items]
Net revenues	4,612	8,475	11,659	10,680
Technology Enabled Solutions
Disaggregation of Revenue [Line Items]
Net revenues	66,530	109,932	284,619	241,336
Technology Enabled Solutions | Supplemental Benefit Services
Disaggregation of Revenue [Line Items]
Net revenues	29,262	48,293	160,021	135,723
Technology Enabled Solutions | Health Plan Management
Disaggregation of Revenue [Line Items]
Net revenues	25,571	45,245	93,150	76,814
Technology Enabled Solutions | Consulting Services
Disaggregation of Revenue [Line Items]
Net revenues	1,701	1,553	6,023	4,754
Technology Enabled Solutions | Software Services
Disaggregation of Revenue [Line Items]
Net revenues	5,384	6,366	13,766	13,365
Technology Enabled Solutions | Data Analytics
Disaggregation of Revenue [Line Items]
Net revenues	4,612	8,475	11,659	10,680
Advisory Services
Disaggregation of Revenue [Line Items]
Net revenues	13,885	30,806	52,977	41,578
Advisory Services | Supplemental Benefit Services
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Advisory Services | Health Plan Management
Disaggregation of Revenue [Line Items]
Net revenues	0	0	0	0
Advisory Services | Consulting Services
Disaggregation of Revenue [Line Items]
Net revenues	13,885	30,806	52,849	41,578
Advisory Services | Software Services
Disaggregation of Revenue [Line Items]
Net revenues	0	0	128	0
Advisory Services | Data Analytics
Disaggregation of Revenue [Line Items]
Net revenues	$ 0	$ 0	$ 0	$ 0