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Concentration of credit risk and current expected credit losses (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Net Product Revenues | Customer Concentration Risk | Customer A |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 19.00% | 18.00% |
Net Product Revenues | Customer Concentration Risk | Customer B |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 13.00% | 15.00% |
Net Product Revenues | Customer Concentration Risk | Customer C |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 18.00% | 16.00% |
Net Product Revenues | Customer Concentration Risk | Customer D |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 11.00% | 12.00% |
Accounts Receivable | Credit Concentration Risk | Collaboration Partner A, B, C and D |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 24.00% |  | 30.00%
Accounts Receivable | Credit Concentration Risk | Customer A, B, C and D |  |  |
Concentration of risk |  |  |
Percentage of concentration risk | 40.00% |  | 39.00%

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