Unpaid Claims - Additional information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Roll Forward In Liability For Unpaid Claims And Claims Adjustment Expense [Abstract]
Unpaid Claims	$ 117,582	$ 90,353	$ 103,976	$ 77,886
Prior years	70,367	$ 59,359
Unfavorable development recognized	$ 1,300
Ratio of current year medical claims paid as a percent of current year net medical claims	61.2	50.9