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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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