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Concentrations of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2019
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, | ​
​ |  | 2019 | ​ | 2018 | ​ | 2017 | ​
Collaboration Partner A | ​ | — | % | 33 | % | 37 | %
Collaboration Partner B | ​ | — | % | 67 | % | 63 | %
Collaboration Partner C | ​ | 77 | % | — | % | — | %
Collaboration Partner D | ​ | 23 | % | — | % | — | %
Schedule of concentration of credit risk related to specialty pharmacy customers | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Percentage of Total Net | ​
​ | ​ | Product Revenues for the | ​
​ | ​ | Years Ended, | ​
​ | ​ | December 31, | ​
​ |  | 2019 | ​ | 2018 | ​ | 2017 | ​
Customer A | ​ | 20 | % | 20 | % | 24 | %
Customer B | ​ | 13 | % | 14 | % | 15 | %
Customer C | ​ | 16 | % | 15 | % | 13 | %
Customer D | ​ | 11 | % | 11 | % | 8 | %

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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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