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Commitment and Contingencies - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended
May 11, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Loss Contingencies [Line Items]        
Operating lease, rent expense   $ 200,000 $ 100,000  
Purchase obligation, to be paid remainder of fiscal year   4,100,000    
Purchase obligation, due in year one   $ 6,000,000.0    
Annual increase in purchase commitments   15.00%    
Licensing Agreements | Subsequent Event        
Loss Contingencies [Line Items]        
Initial license fee $ 400,000      
Minimum | Licensing Agreements        
Loss Contingencies [Line Items]        
Royalty obligation, percent of net sales   2.00%    
Maximum | Licensing Agreements        
Loss Contingencies [Line Items]        
Royalty obligation, percent of net sales   3.00%    
Prometheus Laboratories        
Loss Contingencies [Line Items]        
Remaining milestone obligation   $ 2,000,000.0   $ 2,000,000.0
Remaining milestone obligation, fair value   0   $ 0
Future minimum royalty commitment   1,200,000    
Advance royalties payment   $ 100,000    
Prometheus Laboratories | Minimum        
Loss Contingencies [Line Items]        
Royalty obligation, percent of net sales   2.50%    
Allegheny Health Network Research Institute | Subsequent Event        
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