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Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) segment unit shares	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2016 USD ($)
New Accounting Pronouncement, Early Adoption [Line Items]
Restricted cash	$ 100,000			$ 100,000
Joint venture quarterly promotion fee cap	10.00%			5.00%	5.00%
Joint venture, number of units prescribed quarterly | unit	28,750
Co-promotion agreement, renewal term	12 months
Co-Promotion Agreement, Period Before Current Expiration To Extend Term	180 days
Co-promotion, number of days' noticed required to give to terminate agreement	30 days
Revenue	$ 10,587,000	$ 9,584,000
Advertising expense	$ 300,000	400,000
Dividend yield	0.00%
Number of operating segments | segment	1
Restricted stock units
New Accounting Pronouncement, Early Adoption [Line Items]
Awards granted (in shares) | shares	185,000
Janssen (SIMPONI)
New Accounting Pronouncement, Early Adoption [Line Items]
Revenue	$ 300,000	0
Forecast
New Accounting Pronouncement, Early Adoption [Line Items]
Joint venture quarterly promotion fee cap			10.00%
Minimum
New Accounting Pronouncement, Early Adoption [Line Items]
Joint venture, quarterly promotion fee per prescription	500	750
Joint venture, quarterly promotion fee	300,000			$ 300,000	$ 300,000
Minimum | Forecast
New Accounting Pronouncement, Early Adoption [Line Items]
Joint venture, quarterly promotion fee per prescription			$ 500
Joint venture, quarterly promotion fee			300,000
Maximum
New Accounting Pronouncement, Early Adoption [Line Items]
Joint venture, quarterly promotion fee per prescription		1,250
Maximum | Forecast
New Accounting Pronouncement, Early Adoption [Line Items]
Joint venture, quarterly promotion fee per prescription			$ 1,000
Other assets
New Accounting Pronouncement, Early Adoption [Line Items]
Restricted cash						$ 100,000
Shipping and Handling
New Accounting Pronouncement, Early Adoption [Line Items]
Cost of revenue	$ 500,000	$ 400,000
Revenue Benchmark | Product Concentration Risk | AVISE CTD Test
New Accounting Pronouncement, Early Adoption [Line Items]
Percent of total revenue	81.00%	83.00%
Revenue Benchmark | Supplier Concentration Risk
New Accounting Pronouncement, Early Adoption [Line Items]
Percent of total revenue	98.00%	96.00%

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