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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
May. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Other Commitments [Line Items]        
Facility and equipment rent expense   $ 744,000 $ 554,000 $ 534,000
Provision for recorded liabilities   0    
Future commitments   49,300,000    
Commitments expected to be incurred in fiscal 2016   35,500,000    
Commitments expected to be incurred beyond fiscal 2016   13,800,000    
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%    
Research Facility in Madison        
Other Commitments [Line Items]        
Rental expense   $ 26,000    
Operating lease expiration month and year   2019-02    
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