REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 318		$ 533
Concentration Risk [Line Items]
Revenue	51,917	$ 34,461
Direct contracting costs and reimbursed expenses	$ 26,344	$ 21,743
Revenue, net of direct contracting costs and reimbursed expenses			$ 68,157
One Contracting Customer | Revenue, Net of Direct Contracting Costs and Reimbursed Expenses | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration Risk, Percentage			1.00%
Revenue, net of direct contracting costs and reimbursed expenses			$ 908
One Contracting Customer | Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Revenue			$ 44,888
Concentration Risk, Percentage			27.00%
One Contracting Customer | Direct Contracting Costs and Reimbursed Expenses | Customer Concentration Risk
Concentration Risk [Line Items]
Direct contracting costs and reimbursed expenses			$ 43,980