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Equity method investment - Variable Interest Entity - Summary of Equity Method Investment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Acquisition And Variable Interest Entity [Line Items]
Beginning balance	$ 5,061
Share of Net Income	796	$ 320
Ending balance	$ 5,884
Beijing Falikang Pharmaceutical Co. Ltd [Member]
Acquisition And Variable Interest Entity [Line Items]
Ownership Percentage	51.10%
Beginning balance	$ 5,061
Share of Net Income	796
Currency Translation	27
Ending balance	$ 5,884

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