Revenue - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Revenue	$ 13,163,000	$ 0
Income tax expense	(3,088,000)	(3,148,000)
Exclusive License And Collaboration Agreement
Disaggregation Of Revenue [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
Disaggregation Of Revenue [Line Items]
Potential development and commercial milestones yet to receive	110,000,000.0
Asset Purchase Agreement \| Cypralis Limited
Disaggregation Of Revenue [Line Items]
Revenue recognized	0	0
License Agreement \| Waterstone Pharmaceutical HK Limited
Disaggregation Of Revenue [Line Items]
Revenue recognized	$ 0
Sales Revenue Net \| Customer Concentration Risk \| Wholesaler One
Disaggregation Of Revenue [Line Items]
Percentage of gross revenue	47.00%
Sales Revenue Net \| Customer Concentration Risk \| Wholesaler Two
Disaggregation Of Revenue [Line Items]
Percentage of gross revenue	25.00%
Sales Revenue Net \| Customer Concentration Risk \| Wholesaler Three
Disaggregation Of Revenue [Line Items]
Percentage of gross revenue	23.00%
Product Revenue, Net
Disaggregation Of Revenue [Line Items]
Revenue	$ 1,113,000	$ 0

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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