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Related Party Transactions (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
China Joint Venture      
Related Party Transaction [Line Items]      
Joint venture ownership 80.00% 80.00%  
China Joint Venture | Fosun Pharma Member      
Related Party Transaction [Line Items]      
Joint venture ownership, noncontrolling party 20.00% 20.00%  
China Joint Venture | Subsidiaries | Notes Receivable      
Related Party Transaction [Line Items]      
Related party transaction, amount $ 0 $ 0  
NSP China | Subsidiaries      
Related Party Transaction [Line Items]      
Notes receivable, related parties, current 0   $ 1,200,000
NSP China | Subsidiaries | Company's Joint Venture Partner      
Related Party Transaction [Line Items]      
Notes receivable, related parties, current $ 0   $ 300,000
NSP China | Subsidiaries | Notes Receivable      
Related Party Transaction [Line Items]      
Related party transaction, rate 3.00%