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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
segment
installment
Dec. 31, 2020
USD ($)
Aug. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Restricted cash $ 100,000 $ 100,000      
Contract with customer, timing of performance obligation and payment Collection of the Company's net revenues from payors is normally a function of providing complete and correct billing information to the healthcare insurers and generally occurs within 30 to 90 days of billing        
Revenue recognized $ 700,000 800,000      
Revenue 48,299,000 41,975,000      
Advertising Expense $ 1,700,000 1,300,000      
Dividend yield 0.00%        
Number of annual vesting installments | installment 4        
Number of operating segments | segment 1        
Janssen Promotion Agreement          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Termination of agreement     $ 600,000    
Minimum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 3 years        
Joint venture, quarterly promotion fee per prescription   750      
Joint venture, quarterly promotion fee       $ 300,000 $ 300,000
Maximum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 5 years        
Joint venture, quarterly promotion fee per prescription   1,250      
Shipping and Handling          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cost of revenue $ 2,100,000 $ 1,400,000      
Revenue Benchmark | Supplier Concentration Risk | Two Suppliers          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Concentration risk percentage 97.00% 97.00%      
Revenue Benchmark | AVISE CTD Test | Product Concentration Risk          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Concentration risk percentage 81.00% 70.00%      
Janssen (SIMPONI)          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenue $ 1,200,000 $ 5,100,000      
Other assets          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Restricted cash $ 100,000