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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 |

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