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Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]    
Number of operating segments | segment 1  
Deferred revenue $ 3,532,000 $ 1,283,000
Allowance for doubtful accounts 200,000 200,000
Impairment of long-lived assets 0 0
Impairment of intangible assets 0 0
Goodwill impairments loss $ 0 0
Minimum    
Summary Of Significant Accounting Policies [Line Items]    
Property, plant and equipment, useful Lives 3 years  
Minimum | Product Life and Patent Life    
Summary Of Significant Accounting Policies [Line Items]    
Finite-lived intangible asset, useful life 9 years  
Maximum    
Summary Of Significant Accounting Policies [Line Items]    
Property, plant and equipment, useful Lives 5 years  
Maximum | Product Life and Patent Life    
Summary Of Significant Accounting Policies [Line Items]    
Finite-lived intangible asset, useful life 10 years  
Other Current Assets    
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash $ 200,000 200,000
Inventory $ 3,200,000 $ 800,000
Revenue | Customer Concentration Risk    
Summary Of Significant Accounting Policies [Line Items]    
Concentration risk, percentage 47.00%  
Revenue | Customer Concentration Risk | Covance Central Laboratory Services    
Summary Of Significant Accounting Policies [Line Items]    
Concentration risk, percentage   21.00%
Revenue | Customer Concentration Risk | Medicare    
Summary Of Significant Accounting Policies [Line Items]    
Concentration risk, percentage 17.00% 36.00%
Testing Services    
Summary Of Significant Accounting Policies [Line Items]    
Deferred revenue $ 2,800,000  
Revision of Prior Period, Error Correction, Adjustment    
Summary Of Significant Accounting Policies [Line Items]    
Increase in goodwill   $ 3,400,000
Reduction in accumulated deficit   $ 3,400,000
Error corrections and prior period adjustments, description The 2019 balance sheet has been updated to reflect an increase in goodwill and a reduction in accumulated deficit of $3.4 million related to the correction of an immaterial error recorded as part of the acquisition of Integrated Diagnostics, Inc. in 2018.