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License Agreement Revenue - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Feb. 28, 2021
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Income tax expense	$ 1,100,000	$ 0
Exclusive License And Collaboration Agreement
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Non refundable upfront payment received	10,000,000.0
Transaction price	12,100,000
Fixed upfront cash payment	10,000,000.0
Amount related to withholding tax obligations	1,100,000
Revenue recognized	1,100,000
Income tax expense	1,100,000
Exclusive License And Collaboration Agreement | Maximum
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Potential development and commercial milestones yet to receive			$ 110,000,000.0
Asset Purchase Agreement | Cypralis Limited
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized	0
License Agreement | Waterstone Pharmaceutical HK Limited
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenue recognized	$ 0

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