Revenue Recognition - Disaggregation (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 revenues	$ 198,200	$ 142,026	$ 392,333	$ 294,342
United States
Disaggregation of Revenue [Line Items]
Total revenues	191,886	134,814	379,103	279,771
Americas, excluding U.S.
Disaggregation of Revenue [Line Items]
Total revenues	530	992	1,271	1,805
Europe, Middle East, India, Africa
Disaggregation of Revenue [Line Items]
Total revenues	3,736	4,265	7,427	8,724
Asia Pacific and Other
Disaggregation of Revenue [Line Items]
Total revenues	2,048	1,955	4,532	4,042
Insurance carriers
Disaggregation of Revenue [Line Items]
Total revenues	167,822	118,396	332,564	218,795
Laboratory partners
Disaggregation of Revenue [Line Items]
Total revenues	22,142	15,599	42,879	60,134
Patients
Disaggregation of Revenue [Line Items]
Total revenues	8,236	8,031	16,890	15,413
Licensing and other
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,618	$ 2,379	$ 7,749	$ 34,311