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Commitments and Contingencies - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) ft² | Jan. 31, 2019 ft² | Jun. 30, 2019 USD ($) ft² | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) ft² | Jun. 30, 2018 USD ($) | Oct. 31, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |
Estimated lease payments |  |  | $ 23,318,048 |  | $ 23,318,048 |  |
Facility rent expense |  |  | 418,500 | $ 324,600 | 1,189,800 | $ 954,900 |
Provision for recorded liabilities |  |  | 0 |  | 0 |  |
Future commitments |  |  | 53,800,000 |  | 53,800,000 |  |
Commitments expected to be incurred in fiscal 2019 |  |  | 11,500,000 |  | 11,500,000 |  |
Commitments expected to be incurred beyond fiscal 2019 |  |  | 42,300,000 |  | 42,300,000 |  |
Technology License Commitments |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Milestone payments |  |  | $ 0 | $ 0 | $ 0 | $ 0 |
Corporate Headquarters In Pasadena | California |  |  |  |  |  |  |
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 |  |  |  |  | $ 31,900 |  |
Percentage of increase in annual rental cost |  |  |  |  | 3.00% |  |
Corporate Headquarters In Pasadena | California | Colorado Owner, LLC |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Office space leases, in square feet | ft² | 24,000 |  |  |  |  |  |
Lease term | 91 months |  |  |  |  |  |
Lease payments, commencement date | Nov. 01, 2019 |  |  |  |  |  |
Estimated lease payments | $ 8,800,000 |  |  |  |  |  |
Expected leasehold improvements, net of tenant improvement allowances | $ 3,800,000 |  |  |  |  |  |
Research Facility in Madison | Wisconsin |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Office space leases, in square feet | ft² |  | 13,000 | 58,000 |  | 58,000 |  |
Operating lease expiration month and year |  | 2029-09 |  |  |  |  |
Primary tenant improvement allowance accounted for as deferred rent |  |  | $ 2,100,000 |  | $ 2,100,000 |  |
Promissory note payable |  |  | $ 2,700,000 |  | 2,700,000 |  | $ 2,300,000
Rental expense including payments of principal and interest on the note payable |  |  |  |  | $ 154,800 |  |
Percentage of increase in annual rental cost excluding principal and interest on the note payable |  |  |  |  | 2.50% |  |

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