Revenue Recognition - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 241,756	$ 194,133
United States
Disaggregation of Revenue [Line Items]
Total revenues	233,254	187,217
Americas, excluding U.S.
Disaggregation of Revenue [Line Items]
Total revenues	1,158	741
Europe, Middle East, India, Africa
Disaggregation of Revenue [Line Items]
Total revenues	5,196	3,691
Asia Pacific and Other
Disaggregation of Revenue [Line Items]
Total revenues	2,148	2,484
Insurance carriers
Disaggregation of Revenue [Line Items]
Total revenues	210,378	164,742
Laboratory partners
Disaggregation of Revenue [Line Items]
Total revenues	22,805	20,737
Patients
Disaggregation of Revenue [Line Items]
Total revenues	8,573	8,654
Licensing and other
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,959	$ 4,131