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Concentrations of Credit Risk and Current Expected Credit Losses (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net Product Revenues | Customer Concentration Risk | Customer A |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 20.00% | 20.00% | 20.00%
Net Product Revenues | Customer Concentration Risk | Customer B |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 13.00% | 13.00% | 14.00%
Net Product Revenues | Customer Concentration Risk | Customer C |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 17.00% | 16.00% | 15.00%
Net Product Revenues | Customer Concentration Risk | Customer D |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 11.00% | 11.00% | 11.00%
Accounts Receivable | Credit Concentration Risk | Collaboration Partner A, B, C and D |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 42.00% | 30.00% |
Accounts Receivable | Credit Concentration Risk | Customer A, B, C and D |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 29.00% | 39.00% |

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