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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 |  |  |

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