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Revenue - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation Of Revenue [Line Items]
Revenue		$ 71,553	$ 58,879	$ 142,427	$ 111,322
MRD Revenue
Disaggregation Of Revenue [Line Items]
Revenue		66,168	49,938	133,261	93,659
MRD Revenue | Service Revenue
Disaggregation Of Revenue [Line Items]
Revenue		66,168	44,438	124,261	83,659
MRD Revenue | Regulatory Milestone Revenue
Disaggregation Of Revenue [Line Items]
Revenue		0	5,500	9,000	10,000
Immune Medicine Revenue
Disaggregation Of Revenue [Line Items]
Revenue		5,385	8,941	9,166	17,663
Immune Medicine Revenue | Service and Licensing Revenue
Disaggregation Of Revenue [Line Items]
Revenue		5,385	5,001	9,166	10,123
Immune Medicine Revenue | Collaboration Revenue
Disaggregation Of Revenue [Line Items]
Revenue	[1]	$ 0	$ 3,940	$ 0	$ 7,540
[1] On August 13, 2025, the Genentech Agreement was terminated, with termination effective February 9, 2026.

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