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Variable Interest Entity - Summary of Equity Method Investment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Acquisition And Variable Interest Entity [Line Items]        
Beginning balance     $ 2,728  
Investment income (loss) in unconsolidated variable interest entity $ 342 $ (13) 664 $ (13)
Ending balance $ 3,421   $ 3,421  
Beijing Falikang Pharmaceutical Co. Ltd [Member]        
Acquisition And Variable Interest Entity [Line Items]        
Ownership Percentage 51.10%   51.10%  
Beginning balance     $ 2,728  
Investment income (loss) in unconsolidated variable interest entity     664  
Currency Translation     29  
Ending balance $ 3,421   $ 3,421