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v3.20.2

Other License Agreements - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2020
Related Party Transaction [Line Items] |  |  |
Percentage of Purchase Requirement |  |  | 100.00%
License and supply agreement notice period |  |  | 90 days
Profit sharing ratio |  |  | 0.5
Helsinn License Agreement |  |  |
Related Party Transaction [Line Items] |  |  |
Compensation receivable for grant of rights | $ 20,000,000 |  |
Presage License Agreement | Presage Biosciences, Inc. |  |  |
Related Party Transaction [Line Items] |  |  |
Compensation payable for grant of rights |  | $ 4,900,000 |
Payment for license |  | 2,900,000 |
Presage License Agreement | Presage Biosciences, Inc. | Incremental Payment |  |  |
Related Party Transaction [Line Items] |  |  |
Compensation payable for grant of rights |  | 2,000,000 |
Presage License Agreement | Presage Biosciences, Inc. | Potential Payments on Achievement of Development Regulatory and Commercial Milestones | Maximum |  |  |
Related Party Transaction [Line Items] |  |  |
Milestone payments payable amount |  | $ 179,000,000 |

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