Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($) segment installment	Sep. 30, 2021 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]
Restricted cash	$ 200		$ 100		$ 200	$ 100		$ 100
(Decrease) increase in variable consideration	3,700		100		(2,500)	200
Revenue recognized in previous periods	1,900
Revenue	14,726	$ 7,606	12,251	$ 18,000	32,726	35,610
Advertising expense	1,300		600		$ 2,200	1,300
Number of operating segments | segment					1
Operating lease liabilities	5,775				$ 5,775
Operating lease right-of-use assets	5,114				$ 5,114			0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02
New Accounting Pronouncement, Early Adoption [Line Items]
Operating lease liabilities							$ 6,400
Operating lease right-of-use assets							5,900
Deferred rent credit							$ 500
Janssen Promotion Agreement
New Accounting Pronouncement, Early Adoption [Line Items]
Termination of agreement								$ 600
Restricted stock units
New Accounting Pronouncement, Early Adoption [Line Items]
Number of annual vesting installments | installment					4
Janssen (SIMPONI)
New Accounting Pronouncement, Early Adoption [Line Items]
Revenue	0		400		$ 0	1,000
Shipping and Handling
New Accounting Pronouncement, Early Adoption [Line Items]
Cost of revenue	$ 700		$ 600		$ 2,100	$ 1,600
Revenue Benchmark | Product Concentration Risk | AVISE CTD Test
New Accounting Pronouncement, Early Adoption [Line Items]
Percent of total revenue	87.00%		81.00%		84.00%	81.00%
Revenue Benchmark | Supplier Concentration Risk | Two Major Suppliers
New Accounting Pronouncement, Early Adoption [Line Items]
Percent of total revenue	97.00%		95.00%		96.00%	96.00%