Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accounts payable	$ 23,051	$ 9,554
Capitation payable	2,967	3,541
Subcontractor IPA payable	2,686	1,662
Professional fees	697	1,378
Due to related parties	2,298	50
Contract liabilities	17,259	12,988
Accrued compensation	8,547	6,970
Total accounts payable and accrued expenses	$ 57,505	$ 36,143