Revenue Recognition - Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 268,306	$ 210,637	$ 771,466	$ 602,970
United States
Disaggregation of Revenue [Line Items]
Total revenues	259,870	197,066	746,420	576,169
Americas, excluding U.S.
Disaggregation of Revenue [Line Items]
Total revenues	1,288	1,155	3,652	2,426
Europe, Middle East, India, Africa
Disaggregation of Revenue [Line Items]
Total revenues	5,255	4,956	16,071	12,383
Asia Pacific and Other
Disaggregation of Revenue [Line Items]
Total revenues	1,893	7,460	5,323	11,992
Insurance carriers
Disaggregation of Revenue [Line Items]
Total revenues	239,780	174,825	676,680	507,389
Laboratory partners
Disaggregation of Revenue [Line Items]
Total revenues	21,731	27,050	71,985	69,929
Patients
Disaggregation of Revenue [Line Items]
Total revenues	6,795	8,762	22,801	25,652
Licensing and other
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,088	$ 10,806	$ 10,195	$ 18,555