Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

v3.21.2
Related Party Transactions (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
China Joint Venture Member          
Related Party Transaction [Line Items]          
Joint venture ownership 80.00%   80.00%    
China Joint Venture Member | Fosun Pharma Member          
Related Party Transaction [Line Items]          
Joint venture ownership, noncontrolling party   20.00%   20.00%  
NSP China | Subsidiaries          
Related Party Transaction [Line Items]          
Notes receivable, related parties, current $ 2,400,000   $ 2,400,000   $ 4,800,000
NSP China | Subsidiaries | Company's Joint Venture Partner          
Related Party Transaction [Line Items]          
Notes receivable, related parties, current 600,000   600,000   $ 1,200,000
NSP China | Subsidiaries | Notes Receivable          
Related Party Transaction [Line Items]          
Related party transaction, amount $ 0   $ 0    
Related party transaction, rate     3.00%    
NSP China | Subsidiaries | Notes Receivable | Company's Joint Venture Partner          
Related Party Transaction [Line Items]          
Related party transaction, amount   $ 0   $ 0