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Commitment and Contingencies - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
ft²
leaseExtention
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ft²
leaseExtention
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]          
Rent expense $ 100,000 $ 100,000 $ 300,000 $ 300,000  
Minimum annual purchase commitment     $ 3,250,000    
Purchase commitment, term     3 years    
Minimum | Licensing Agreements          
Loss Contingencies [Line Items]          
Royalty obligation, percent of net sales 3.00%   3.00%    
Maximum          
Loss Contingencies [Line Items]          
Royalty obligation, percent of net sales 20.00%   20.00%    
Prometheus Laboratories          
Loss Contingencies [Line Items]          
Remaining milestone obligation $ 2,000,000.0   $ 2,000,000.0    
Remaining milestone obligation, fair value 0   0   $ 0
Advance royalties payment $ 100,000   $ 100,000    
Prometheus Laboratories | Minimum          
Loss Contingencies [Line Items]          
Royalty obligation, percent of net sales 2.50%   2.50%    
Prometheus Laboratories | Maximum          
Loss Contingencies [Line Items]          
Royalty obligation, percent of net sales 7.50%   7.50%    
Future minimum royalty commitment $ 4,200,000   $ 4,200,000    
Office and Laboratory          
Loss Contingencies [Line Items]          
Operating lease, rentable area (square feet) | ft² 14,000   14,000    
Number of operating lease extensions | leaseExtention 2   2    
Operating lease, renewal term 36 months   36 months    
Office          
Loss Contingencies [Line Items]          
Operating lease, rentable area (square feet) | ft² 19,500   19,500    
Operating lease, renewal term 24 months   24 months