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Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment installment	Jun. 30, 2021 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]
Restricted cash	$ 100,000		$ 100,000			$ 100,000
Increase (decrease) in variable consideration	(1,200,000)	$ 100,000	(1,600,000)	$ (100,000)
Revenue	7,606,000	12,772,000	18,000,000	23,359,000
Advertising expense	600,000	400,000	$ 900,000	600,000
Number of operating segments | segment			1
Operating lease liabilities	6,006,000		$ 6,006,000
Operating lease right-of-use assets	5,338,000		$ 5,338,000			0
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-02
New Accounting Pronouncement, Early Adoption [Line Items]
Operating lease liabilities					$ 6,400,000
Operating lease right-of-use assets					5,900,000
Deferred rent credit					$ 500,000
Janssen Promotion Agreement
New Accounting Pronouncement, Early Adoption [Line Items]
Termination of agreement						$ 600,000
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	300,000	$ 0	600,000
Shipping and Handling
New Accounting Pronouncement, Early Adoption [Line Items]
Cost of revenue	$ 700,000	$ 600,000	$ 1,300,000	$ 1,000,000.0
Revenue Benchmark | Product Concentration Risk | AVISE CTD Test
New Accounting Pronouncement, Early Adoption [Line Items]
Percent of total revenue	77.00%	77.00%	81.00%	81.00%
Revenue Benchmark | Supplier Concentration Risk | Two Major Suppliers
New Accounting Pronouncement, Early Adoption [Line Items]
Percent of total revenue	97.00%	97.00%	96.00%	97.00%

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