Summary of Significant Accounting Policies - Schedule of Earned Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 308,739	$ 243,956	$ 575,739	$ 468,222
Premium
Disaggregation of Revenue [Line Items]
Total revenues	293,435	223,081	558,148	427,358
Capitation
Disaggregation of Revenue [Line Items]
Total revenues	$ 15,304	$ 20,875	$ 17,591	$ 40,864