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Commitments and Contingencies - Additional Information (Detail)
 3 Months Ended
Dec. 31, 2015
USD ($)
ft²
Dec. 31, 2014
USD ($)
Other Commitments [Line Items]    
Facility rent expense $ 198,600 $ 171,500
Provision for recorded liabilities 0  
Future commitments 47,500,000  
Commitments expected to be incurred in fiscal 2016 25,200,000  
Commitments expected to be incurred beyond fiscal 2016 23,300,000  
Corporate Headquarters In Pasadena    
Other Commitments [Line Items]    
Rental expense $ 24,000  
Operating lease expiration month and year 2019-09  
Percentage of increase in annual rental cost 3.00%  
Office space leases, in square feet | ft² 8,500  
Research Facility in Madison    
Other Commitments [Line Items]    
Rental expense $ 26,000  
Operating lease expiration date Feb. 28, 2019  
Other rental expenses including common area maintenance and real estate taxes $ 18,000  
Utilities costs per month 16,000  
Monthly payments under capital lease 19,000  
Total Monthly Facility Expense - Madison facility 79,000  
Research Facility in Middleton    
Other Commitments [Line Items]    
Rental expense $ 4,000  
Operating lease expiration month and year 2016-05  
Other rental expenses including common area maintenance and real estate taxes $ 2,000