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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 07, 2018
USD ($)
ft²
Jul. 31, 2017
USD ($)
ft²
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Commitments And Contingencies [Line Items]        
Laboratory and office space to be leased | ft²   41,346    
Operating lease annual rent   $ 3,200,000    
Term of lease   10 years    
Tenant improvement investment   $ 1,600,000    
Letter of credit   $ 1,000,000    
Renewal term of lease   5 years    
Lessee, operating lease, existence of option to extend   true   true
Lessee, operating lease, existence of option to terminate   true    
Cash paid included in operating cash flows     $ 1,000,000 $ 2,700,000
Total right-of-use asset for finance leases     900,000 $ 900,000
Master Services Agreement | Azzur Group, LLC        
Commitments And Contingencies [Line Items]        
Access and use of space under agreement | ft² 700      
Term of agreement 44 months      
Agreement expiration date Dec. 31, 2022      
Term of prior terminate written notice 4 months      
Increase in ROU asset     1,100,000  
Increase in long-term lease liability     1,200,000  
Decrease in current lease liability     $ (100,000)  
Master Services Agreement | Maximum | Azzur Group, LLC        
Commitments And Contingencies [Line Items]        
Estimated project costs $ 4,800,000