Intangible Assets, Net - Schedule of Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Indefinite lived assets:
Impairment/ Disposal	$ 0	$ (1,994,000)
Amortized intangible assets:
Additions	0	34,047,000
Accumulated Amortization	(89,544,000)	(73,517,000)
Total	86,985,000
Intangible Assets, Gross	176,529,000	176,529,000	$ 144,476,000
Intangible Assets, Net	86,985,000	103,012,000
Network relationships
Amortized intangible assets:
Beginning Balance, Gross	143,930,000	109,883,000
Additions	0	34,047,000
Ending Balance, Gross	143,930,000	143,930,000
Accumulated Amortization	(73,169,000)	(60,525,000)
Total	$ 70,761,000	$ 83,405,000
Network relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	11 years	11 years
Network relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	15 years	15 years
Management contracts
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	15 years	15 years
Amortized intangible assets:
Beginning Balance, Gross	$ 22,832,000	$ 22,832,000
Additions	0	0
Ending Balance, Gross	22,832,000	22,832,000
Accumulated Amortization	(11,715,000)	(9,677,000)
Total	$ 11,117,000	$ 13,155,000
Member relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	12 years	12 years
Amortized intangible assets:
Beginning Balance, Gross	$ 6,696,000	$ 6,696,000
Additions	0	0
Ending Balance, Gross	6,696,000	6,696,000
Accumulated Amortization	(3,234,000)	(2,352,000)
Total	$ 3,462,000	$ 4,344,000
Patient management platform
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	5 years	5 years
Amortized intangible assets:
Beginning Balance, Gross	$ 2,060,000	$ 2,060,000
Additions	0	0
Ending Balance, Gross	2,060,000	2,060,000
Accumulated Amortization	(1,270,000)	(858,000)
Total	$ 790,000	$ 1,202,000
Tradename/trademarks
Finite-Lived Intangible Assets [Line Items]
Useful Life (Years)	20 years	20 years
Amortized intangible assets:
Beginning Balance, Gross	$ 1,011,000	$ 1,011,000
Additions	0	0
Ending Balance, Gross	1,011,000	1,011,000
Accumulated Amortization	(156,000)	(105,000)
Total	855,000	906,000
Medicare license
Indefinite lived assets:
Beginning Balance	$ 0	1,994,000
Additions		0
Impairment/ Disposal		(1,994,000)
Ending Balance		$ 0