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Concentration of credit risk | 9 Months Ended
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Sep. 30, 2019
Concentration of credit risk |
Concentration of credit risk | 5. Concentration of credit risk In December 2009, we entered into a license, development and commercialization agreement with Lilly. In November 2009, we entered into a collaboration and license agreement with Novartis. In December 2018, we entered into a research collaboration and licensing agreement with Innovent Biologics, Inc. (“Innovent”). In July 2019, we entered into a collaboration and license agreement with Zai Lab (Shanghai) Co., Ltd., a subsidiary of Zai Lab Limited (collectively, “Zai Lab”). The concentration of credit risk related to our collaborative partners is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Percentage of Total | ​ | Percentage of Total | ​
​ | ​ | Milestone and Contract Revenues for the | ​ | Milestone and Contract Revenues for the | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2019 |  | 2018 |  | ​ | 2019 |  | 2018 |  |
Collaboration Partner A |  | — | % | — | % |  | — | % | — | % | ​
Collaboration Partner B |  | — | % | 100 | % | ​ | — | % | 100 | % | ​
Collaboration Partner C | ​ | — | % | — | % | ​ | 77 | % | — | % | ​
Collaboration Partner D |  | 100 | % | — | % |  | 23 | % | — | % | ​
​ Collaboration Partners A, B, C and D comprised, in aggregate, 33% and 42% of the accounts receivable balance as of September 30, 2019 and December 31, 2018, respectively. In November 2011, we began commercialization and distribution of JAKAFI to a number of customers. Our product revenues are concentrated in a number of these customers. The concentration of credit risk related to our JAKAFI product revenues is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Percentage of Total Net | ​ | Percentage of Total Net | ​
​ | ​ | Product Revenues for the | ​ | Product Revenues for the | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2019 |  | 2018 |  | ​ | 2019 |  | 2018 |  |
Customer A |  | 20 | % | 19 | % |  | 19 | % | 20 | % | ​
Customer B |  | 14 | % | 12 | % |  | 14 | % | 13 | % | ​
Customer C |  | 16 | % | 16 | % |  | 16 | % | 15 | % | ​
Customer D |  | 11 | % | 12 | % |  | 12 | % | 11 | % | ​
​ We are exposed to risks associated with extending credit to customers related to the sale of products. Customers A, B, C and D comprised, in aggregate, 38% and 30% of the accounts receivable balance as of September 30, 2019 and December 31, 2018, respectively. The concentration of credit risk relating to ICLUSIG product revenues or accounts receivable is not significant.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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