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Commitments and Contingencies - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2019 USD ($) ft² | Sep. 17, 2018 USD ($) ft² | Jul. 31, 2019 USD ($) ft² | Feb. 28, 2019 USD ($) | Feb. 28, 2018 USD ($) | Nov. 30, 2009 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Tenant improvement allowance |  |  |  |  |  |  |  |  | $ 6,639,000
Sublease income |  |  |  |  |  |  |  | $ 891,000 | 891,000
Cash paid for amounts included in the measurement of operating lease liabilities |  |  |  |  |  |  |  |  | $ 3,800,000
Operating lease, weighted average remaining lease term |  |  |  |  |  |  |  | 9 years 9 months 18 days | 9 years 9 months 18 days
Operating lease, weighted average discount rate |  |  |  |  |  |  |  | 10.10% | 10.10%
Maximum borrowing capacity |  |  |  |  | $ 175,000,000.0 |  |  |  |
Principal amount including interest paid in kind |  |  |  |  | $ 179,100,000 |  |  | $ 179,100,000 | $ 179,100,000
Debt maturity date |  |  |  |  | Dec. 31, 2023 |  |  |  | Dec. 31, 2023
Non-cancelable purchase and other commitments |  |  |  |  |  |  |  | $ 13,000,000.0 | $ 13,000,000.0
Symphony Dynamo Holdings LLC |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
License arrangement contingent consideration percentage |  |  |  |  |  | 50.00% |  |  |
License arrangement upfront payment |  |  |  |  |  | $ 50,000,000 |  |  |
Milestone payments |  |  |  |  |  |  |  |  | $ 0
Sublicense Agreement | Merck, Sharp & Dohme Corp. |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Payment upon obligation |  |  |  | $ 7,000,000.0 | $ 7,000,000.0 |  |  |  |
Scenario, Forecast | Sublicense Agreement | Merck, Sharp & Dohme Corp. |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Payment upon obligation |  |  |  |  |  |  | $ 7,000,000.0 |  |
Powell Street Sublease | Emeryville, California (Premises) |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Lease area | ft² | 23,976 |  | 23,976 |  |  |  |  |  |
Base rent per square feet | $ 3.90 |  |  |  |  |  |  |  |
Lease expiration date | Jun. 30, 2022 |  |  |  |  |  |  |  |
Option to extend |  |  |  |  |  |  |  |  | There is no option to extend the sublease term
Existence of option to extend |  |  |  |  |  |  |  |  | false
Horton Street Master Lease |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of excess rent paid to landlord |  |  |  |  |  |  |  | 50.00% | 50.00%
Horton Street Master Lease | Emeryville, California (Premises) |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Lease area | ft² |  | 75,662 |  |  |  |  |  |  |
Base rent per square feet |  | $ 4.75 |  |  |  |  |  |  |
Operations commencement date |  | Apr. 01, 2019 |  |  |  |  |  |  |
Initial lease term |  | 12 years |  |  |  |  |  |  |
Lease option to extend |  | The Horton Street Master Lease has an initial term of 12 years, following the Commencement Date with an option to extend the lease for two successive five-year terms. |  |  |  |  |  |  |
Renewal term of lease |  | 5 years |  |  |  |  |  |  |
Horton Street Master Lease | Emeryville, California (Premises) | Maximum |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Tenant improvement allowance |  | $ 8,300,000 |  |  |  |  |  |  |
Horton Street Sublease | Emeryville, California (Premises) |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Lease area | ft² | 75,662 |  | 75,662 |  |  |  |  |  |
Base rent per square feet |  |  | $ 5.50 |  |  |  |  |  |
Lease expiration date |  |  | Mar. 31, 2031 |  |  |  |  |  |
Option to extend |  |  | The Subtenant has no option to extend the sublease term. |  |  |  |  |  |
Existence of option to extend |  |  | false |  |  |  |  |  |
Sublease income |  |  |  |  |  |  |  |  | $ 900,000
Horton Street Sublease | Emeryville, California (Premises) | Other Income (Expense) |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Sublease income |  |  |  |  |  |  |  | $ 900,000 |

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