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Commitment and Contingencies - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 23, 2021
May 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loss Contingencies [Line Items]            
Operating lease, rent expense     $ 200,000 $ 300,000 $ 500,000 $ 500,000
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     $ 100,000   $ 200,000  
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]            
Payments to acquire intellectual property         $ 100,000  
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  
Operating lease monthly base rent $ 66,021          
Operating lease annual increase in base rent payment percent 3.00%