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Commitments and Contingencies - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
ft²
Mar. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
ft²
Mar. 31, 2017
USD ($)
Other Commitments [Line Items]        
Facility rent expense $ 304,700 $ 416,800 $ 797,900 $ 630,300
Provision for recorded liabilities 0   0  
Future commitments 23,500,000   23,500,000  
Commitments expected to be incurred in fiscal 2018 13,500,000   13,500,000  
Commitments expected to be incurred beyond fiscal 2018 10,000,000   10,000,000  
Technology License Commitments        
Other Commitments [Line Items]        
Milestone payments $ 0 $ 0 $ 0 $ 0
Corporate Headquarters In Pasadena        
Other Commitments [Line Items]        
Office space leases, in square feet | ft² 8,500   8,500  
Operating lease expiration month and year     2019-09  
Rental expense     $ 27,000  
Percentage of increase in annual rental cost     3.00%  
Research Facility in Madison        
Other Commitments [Line Items]        
Office space leases, in square feet | ft² 60,000   60,000  
Operating lease expiration month and year     2026-09  
Primary tenant improvement allowance accounted for as deferred rent $ 2,100,000   $ 2,100,000  
Promissory note payable $ 2,700,000   2,700,000  
Rental expense including payments of principal and interest on the note payable     $ 182,200  
Percentage of increase in annual rental cost excluding principal and interest on the note payable     2.50%  
Promissory notes payable amortized term     10 years  
Promissory note commencement date     Oct. 01, 2016  
Promissory note interest rate     7.10%