Basis of Presentation and Summary of Significant Accounting Policies - Disaggregation of Revenue by Payor Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 773,915	$ 687,180	$ 560,618
Commercial
Disaggregation of Revenue [Line Items]
Revenue	138,333	108,851	107,340
Medicare
Disaggregation of Revenue [Line Items]
Revenue	307,286	271,596	226,002
Medicaid
Disaggregation of Revenue [Line Items]
Revenue	283,311	269,079	192,596
Other third parties
Disaggregation of Revenue [Line Items]
Revenue	$ 44,985	$ 37,654	$ 34,680