Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 117,169	$ 115,533
Clinical Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	98,791	96,487
Clinical Services | Client direct billing
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	65,014	60,709
Clinical Services | Commercial Insurance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	18,288	18,574
Clinical Services | Medicare and Medicaid
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	15,465	17,150
Clinical Services | Self-Pay
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	24	54
Pharma Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total net revenue	$ 18,378	$ 19,046