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Commitments and Contingencies - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jan. 08, 2016 USD ($) ft² Option | Sep. 30, 2016 USD ($) ft² | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Other Commitments [Line Items] |  |  |  |
Facility rent expense |  | $ 839,000 | $ 744,000 | $ 554,000
Provision for recorded liabilities |  | 0 |  |
Future commitments |  | 10,400,000 |  |
Commitments expected to be incurred in fiscal 2017 |  | 10,400,000 |  |
Commitments expected to be incurred beyond fiscal 2017 |  | 0 |  |
Technology License Commitments |  |  |  |
Other Commitments [Line Items] |  |  |  |
Milestone payments |  | 3,000,000 | $ 1,000,000 | $ 1,000,000
Corporate Headquarters In Pasadena |  |  |  |
Other Commitments [Line Items] |  |  |  |
Rental expense |  | $ 26,000 |  |
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 |  |
Office space leases, in square feet | ft² | 60,000 |  |  |
Operating lease initial term | 10 years |  |  |
Operating lease commencement date | Jan. 01, 2016 |  |  |
Operating lease available for occupancy month and year |  | 2016-10 |  |
Operating lease payments during initial term | $ 15,200,000 |  |  |
Estimated payment for real estate taxes, operating expenses and common area maintenance expenses | 600,000 |  |  |
Amount paid or accrued for leasehold improvements, net of tenant improvement allowances |  | $ 7,000,000 |  |
Primary tenant improvement allowance accounted for as deferred rent | 2,100,000 |  |  |
Secondary tenant improvement allowance accounted for as note payable | $ 2,700,000 |  |  |
Number of renewal options | Option | 2 |  |  |
Operating leases renewal term | 5 years |  |  |
Other rental expenses including common area maintenance and real estate taxes |  | 20,000 |  |
Utilities costs per month |  | 18,000 |  |
Monthly payments under capital lease |  | 19,000 |  |
Total Monthly Facility Expense - Madison facility |  | 83,000 |  |
Promissory note payable |  | $ 2,700,000 |  |
Promissory notes payable amortized term |  | 10 years |  |
Promissory note commencement date |  | Oct. 01, 2016 |  |
Promissory note interest rate |  | 7.10% |  |
Research Facility in Middleton |  |  |  |
Other Commitments [Line Items] |  |  |  |
Rental expense |  | $ 14,000 |  |
Operating lease expiration month and year |  | 2016-12 |  |
Other rental expenses including common area maintenance and real estate taxes |  | $ 4,000 |  |

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