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Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) ft² | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) ft² | Mar. 31, 2016 USD ($)
Other Commitments [Line Items] |  |  |  |
Facility rent expense | $ 416,800 | $ 228,400 | $ 797,900 | $ 427,000
Provision for recorded liabilities | 0 |  | 0 |
Future commitments | 11,400,000 |  | 11,400,000 |
Commitments expected to be incurred in fiscal 2017 | 7,100,000 |  | 7,100,000 |
Commitments expected to be incurred beyond fiscal 2017 | 4,400,000 |  | 4,400,000 |
Technology License Commitments |  |  |  |
Other Commitments [Line Items] |  |  |  |
Milestone payments | $ 0 | $ 0 | $ 0 | $ 0
Corporate Headquarters In Pasadena |  |  |  |
Other Commitments [Line Items] |  |  |  |
Office space leases, in square feet | ft² | 8,500 |  | 8,500 |
Operating lease expiration month and year |  |  | 2019-09 |
Rental expense |  |  | $ 27,000 |
Percentage of increase in annual rental cost |  |  | 3.00% |
Research Facility in Madison |  |  |  |
Other Commitments [Line Items] |  |  |  |
Office space leases, in square feet | ft² | 60,000 |  | 60,000 |
Operating lease expiration month and year |  |  | 2026-09 |
Primary tenant improvement allowance accounted for as deferred rent | $ 2,100,000 |  | $ 2,100,000 |
Secondary tenant improvement allowance accounted for as note payable | 2,700,000 |  | 2,700,000 |
Rental expense including common area maintenance and real estate taxes and payments of principal and interest on the note payable |  |  | 180,200 |
Promissory note payable | $ 2,700,000 |  | $ 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] |  |  |  |
Operating lease expiration month and year |  |  | 2016-12 |
Rental expense |  |  | $ 14,000 |
Other rental expenses including common area maintenance and real estate taxes |  |  | $ 4,000 |

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