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Summary of Significant Accounting Policies - Schedule of Changes in Contractual Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward]
Balance, beginning of year	$ 15,433	$ 9,205	$ 6,345
Add: allowance for contractual adjustments	20,916	15,518	9,095
Less: contractual adjustments	(15,068)	(9,290)	(6,235)
Balance, end of year	$ 21,281	$ 15,433	$ 9,205