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Commitment and Contingencies - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Loss Contingencies [Line Items]            
Operating lease, rent expense   $ 200,000 $ 100,000 $ 300,000 $ 200,000  
Purchase obligation, to be paid remainder of fiscal year   4,100,000   4,100,000    
Purchase obligation, due in year one   $ 6,000,000.0   $ 6,000,000.0    
Annual increase in purchase commitments   15.00%   15.00%    
AHN Collaboration            
Loss Contingencies [Line Items]            
Collaboration agreement, collaboration expenses   $ 67,000   $ 67,000    
Licensing Agreements            
Loss Contingencies [Line Items]            
Initial license fee $ 400,000          
Minimum | Licensing Agreements            
Loss Contingencies [Line Items]            
Royalty obligation, percent of net sales   1.50%   1.50%    
Maximum | Licensing Agreements            
Loss Contingencies [Line Items]            
Royalty obligation, percent of net sales   3.00%   3.00%    
Prometheus Laboratories            
Loss Contingencies [Line Items]            
Remaining milestone obligation   $ 2,000,000.0   $ 2,000,000.0   $ 2,000,000.0
Remaining milestone obligation, fair value   0   0   $ 0
Future minimum royalty commitment   1,200,000   1,200,000    
Advance royalties payment   $ 100,000   $ 100,000    
Prometheus Laboratories | Minimum            
Loss Contingencies [Line Items]            
Royalty obligation, percent of net sales   2.50%   2.50%    
Allegheny Health Network Research Institute            
Loss Contingencies [Line Items]            
Collaboration fee $ 400,000          
Office and Laboratory            
Loss Contingencies [Line Items]            
Operating lease, renewal term       5 years    
Office            
Loss Contingencies [Line Items]            
Operating lease, renewal term       5 years