Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total Revenue	$ 125,072	$ 121,724	$ 242,241	$ 237,257
Clinical Services
Disaggregation of Revenue [Line Items]
Total Revenue	105,635	101,405	204,426	197,892
Clinical Services | Client direct billing
Disaggregation of Revenue [Line Items]
Total Revenue	69,874	63,137	134,888	123,846
Clinical Services | Commercial Insurance
Disaggregation of Revenue [Line Items]
Total Revenue	18,512	20,528	36,800	39,102
Clinical Services | Medicare and Medicaid
Disaggregation of Revenue [Line Items]
Total Revenue	17,167	17,484	32,632	34,634
Clinical Services | Self-Pay
Disaggregation of Revenue [Line Items]
Total Revenue	82	256	106	310
Pharma Services
Disaggregation of Revenue [Line Items]
Total Revenue	$ 19,437	$ 20,319	$ 37,815	$ 39,365