Revenue - Schedule of Disaggregated 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]
Revenue	$ 43,660	$ 38,505	$ 82,280	$ 76,947
Immune Medicine Revenue
Disaggregation Of Revenue [Line Items]
Revenue	22,378	23,039	43,194	43,144
Immune Medicine Revenue | Service Revenue
Disaggregation Of Revenue [Line Items]
Revenue	7,296	5,405	14,409	9,453
Immune Medicine Revenue | Collaboration Revenue
Disaggregation Of Revenue [Line Items]
Revenue	15,082	17,634	28,785	33,691
MRD Revenue
Disaggregation Of Revenue [Line Items]
Revenue	21,282	15,466	39,086	33,803
MRD Revenue | Service Revenue
Disaggregation Of Revenue [Line Items]
Revenue	20,282	13,966	35,086	25,303
MRD Revenue | Regulatory Milestone Revenue
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,000	$ 1,500	$ 4,000	$ 8,500