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Concentrations of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2018
Concentrations of Credit Risk |
Schedule of concentration of credit risk related to collaborative partners |
|  | Percentage of Total Milestone and |
|  | Contract Revenues for the |
|  | Years Ended, |
|  | December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Collaboration Partner A |  | 33 | % | 37 | % | 40 | %
Collaboration Partner B |  | 67 | % | 63 | % | 60 | %
Schedule of concentration of credit risk related to specialty pharmacy customers |
|  | Percentage of Total Net |
|  | Product Revenues for the |
|  | Years Ended, |
|  | December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Customer A |  | 20 | % | 24 | % | 25 | %
Customer B |  | 14 | % | 15 | % | 17 | %
Customer C |  | 15 | % | 13 | % | 13 | %
Customer D |  | 11 | % | 8 | % | 9 | %

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark, related to the collaborative partners. + References No definition available. + Details
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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark, related to the specialty pharmaceutical customers. + References No definition available. + Details
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- References No definition available. + Details
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