Commitments and Contingencies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Commitments [Line Items]
Facility and equipment rent expense	$ 182,000	$ 138,000	$ 544,000	$ 403,000
Provision for recorded liabilities	0		0
Future commitments	51,000,000		51,000,000
Commitments expected to be incurred in fiscal 2015	13,000,000		13,000,000
Commitments expected to be incurred beyond fiscal 2015	$ 38,000,000		38,000,000
Corporate Headquarters In Pasadena
Other Commitments [Line Items]
Rental expense			$ 23,000
Operating lease expiration date			Sep. 30, 2019
Percentage of increase in annual rental cost			3.00%
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