SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
ACO REACH revenue	$ 200,044	$ 145,433	$ 676,845	$ 465,435
Investment income (loss)	6	4,848	16	(52,301)
Total revenue	269,399	193,363	867,931	523,467
Operating income (loss)	(462,775)	(95,927)	(531,061)	(277,850)
Depreciation and amortization	4,117	8,947	14,271	25,283
Bad debt expense	22,421	11	23,054	11
Restructuring charges	5,281	5	6,867	9,662
Goodwill impairment	401,385	0	401,385	0
Impairment of intangible assets	0	42,611	0	42,611
Total unaffiliated revenue
Segment Reporting Information [Line Items]
Total revenue	269,399	193,363	867,931	523,467
Affiliated revenue
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Capitated revenue
Segment Reporting Information [Line Items]
Revenue	60,371	33,006	159,683	79,295
Service revenue
Segment Reporting Information [Line Items]
Revenue	8,978	10,076	31,387	31,038
Corporate & Eliminations
Segment Reporting Information [Line Items]
ACO REACH revenue	0	0	0	0
Investment income (loss)	6	4,848	16	(52,301)
Total revenue	1,488	(252,859)	(6,471)	(882,399)
Operating income (loss)	(42,659)	(50,185)	(130,099)	(214,348)
Depreciation and amortization	957	2,573	4,801	6,164
Bad debt expense	0	7	0	7
Restructuring charges	5,151	5	6,737	9,662
Goodwill impairment	0		0
Impairment of intangible assets		0		0
Corporate & Eliminations | Total unaffiliated revenue
Segment Reporting Information [Line Items]
Total revenue	6	4,848	16	(52,301)
Corporate & Eliminations | Affiliated revenue
Segment Reporting Information [Line Items]
Total revenue	1,482	(257,707)	(6,487)	(830,098)
Corporate & Eliminations | Capitated revenue
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Corporate & Eliminations | Service revenue
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Care Delivery
Segment Reporting Information [Line Items]
Restructuring charges	130	0	130	0
Care Delivery | Operating Segments
Segment Reporting Information [Line Items]
ACO REACH revenue	0	0	0	0
Investment income (loss)	0	0	0	0
Total revenue	67,134	300,763	195,881	940,353
Operating income (loss)	(390,761)	(42,627)	(373,094)	(65,376)
Depreciation and amortization	3,160	6,374	9,470	19,119
Bad debt expense	8	4	639	4
Restructuring charges	130	0	130	0
Goodwill impairment	401,385		401,385
Impairment of intangible assets		42,611		42,611
Care Delivery | Operating Segments | Total unaffiliated revenue
Segment Reporting Information [Line Items]
Total revenue	68,616	43,056	189,394	110,255
Care Delivery | Operating Segments | Affiliated revenue
Segment Reporting Information [Line Items]
Total revenue	(1,482)	257,707	6,487	830,098
Care Delivery | Operating Segments | Capitated revenue
Segment Reporting Information [Line Items]
Revenue	60,371	33,006	159,683	79,295
Care Delivery | Operating Segments | Service revenue
Segment Reporting Information [Line Items]
Revenue	8,245	10,050	29,711	30,960
Care Solutions
Segment Reporting Information [Line Items]
Restructuring charges	0	0	0	0
Care Solutions | Operating Segments
Segment Reporting Information [Line Items]
ACO REACH revenue	200,044	145,433	676,845	465,435
Investment income (loss)	0	0	0	0
Total revenue	200,777	145,459	678,521	465,513
Operating income (loss)	(29,355)	(3,115)	(27,868)	1,874
Depreciation and amortization	0	0	0	0
Bad debt expense	22,413	0	22,415	0
Restructuring charges	0	0	0	0
Goodwill impairment	0		0
Impairment of intangible assets		0		0
Care Solutions | Operating Segments | Total unaffiliated revenue
Segment Reporting Information [Line Items]
Total revenue	200,777	145,459	678,521	465,513
Care Solutions | Operating Segments | Affiliated revenue
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Care Solutions | Operating Segments | Capitated revenue
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Care Solutions | Operating Segments | Service revenue
Segment Reporting Information [Line Items]
Revenue	$ 733	$ 26	$ 1,676	$ 78