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Commitments and Contingencies - Additional Information (Detail) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 28, 2019 | Feb. 12, 2019 USD ($) ft² | Jan. 01, 2017 ft² | Oct. 01, 2015 | Apr. 15, 2015 Option | Jul. 28, 2014 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total lease payments over the initial term |  |  |  |  |  |  | $ 11,296,000 |  |  | $ 11,296,000 |
Sublease rental income |  |  |  |  |  |  | 28,000 |  |  | 83,000 |
Lease expense |  |  |  |  |  |  | 374,000 | $ 100,000 |  | 679,000 | $ 300,000
Milestone payments due |  |  |  |  |  |  | 0 | $ 0 |  | 0 | $ 0
Subsequent Licensed Product [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Licensing fees per product maximum |  |  |  |  |  |  | 1,300,000 |  |  | 1,300,000 |
Maximum [Member] | Pre Commercialization Milestones [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Milestone payments |  |  |  |  |  |  | 12,300,000 |  |  | 12,300,000 |
Maximum [Member] | Product Commercialization Milestones [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Milestone payments |  |  |  |  |  |  | 12,500,000 |  |  | 12,500,000 |
Research and Development [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease expense |  |  |  |  |  |  | 200,000 |  |  | 500,000 |
General and Administrative [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease expense |  |  |  |  |  |  | $ 200,000 |  |  | $ 200,000 |
Boston Office Space [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease expiration date |  |  |  |  |  | Jul. 31, 2020 |  |  |  |  |
Amendment of lease, effective date of termination | Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |
Boston Office Space [Member] | Unrelated Third Party [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subleased area | ft² |  |  | 2,976 |  |  |  |  |  |  |  |
Sublease expiration date |  |  | Jun. 30, 2020 |  |  |  |  |  |  |  |
Boston Office Space [Member] | Unrelated Third Party [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sublease rental income |  |  |  |  |  |  |  |  | $ 100,000 |  |
Additional Boston Office Space [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease extension period |  |  |  |  | 3 years |  |  |  |  |  |
Operating lease, existence of option to extend |  |  |  |  | true |  |  |  |  |  |
Lease expiration date |  |  |  |  | Jul. 31, 2020 |  |  |  |  |  |
Number of options to extend lease | Option |  |  |  |  | 1 |  |  |  |  |  |
San Diego Office Space [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease expiration date |  |  |  | Dec. 31, 2024 |  |  |  |  |  |  |
Center Plaza, Boston [Member] | Massachusetts [Member] | Shigo Center Plaza Owners LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of office space | ft² |  | 17,705 |  |  |  |  |  |  |  |  |
Operating lease term |  | 124 months |  |  |  |  |  |  |  |  |
Lease extension period |  | 60 months |  |  |  |  |  |  |  |  |
Letter of credit |  | $ 1,300,000 |  |  |  |  |  |  |  |  |
Operating lease, existence of option to extend |  | true |  |  |  |  |  |  |  |  |
Total lease payments over the initial term |  | $ 10,700,000 |  |  |  |  |  |  |  |  |
Lease commencement date |  | Jun. 21, 2019 |  |  |  |  |  |  |  |  |

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