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Equity method investment - Variable Interest Entity - Summary of Equity Method Investment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Acquisition And Variable Interest Entity [Line Items]
Beginning balance	$ 5,061
Share of Net Income	2,638	$ 1,573	$ 1,007
Ending balance	$ 5,290	5,061
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	2,638
Dividend Received	(2,255)
Currency Translation	(154)
Ending balance	$ 5,290	$ 5,061

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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