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Concentrations of Credit Risk and Current Expected Credit Losses | 12 Months Ended
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Dec. 31, 2023
Risks and Uncertainties [Abstract] |
Concentrations of Credit Risk and Current Expected Credit Losses | Note 4. Concentration of Credit Risk and Current Expected Credit Losses In November 2009, we entered into a collaboration and license agreement with Novartis. In December 2009, we entered into a license, development and commercialization agreement with Lilly. The above collaboration partners comprised, in aggregate, 20% and 20% of the accounts receivable balance as of December 31, 2023 and 2022, respectively. For further information relating to these collaboration and license agreements, refer to Note 7. In November 2011, we began commercialization and distribution of JAKAFI, in April 2020, we began commercialization and distribution of PEMAZYRE and in October 2021, we began commercialization and distribution of OPZELURA. Our product revenues are concentrated in a number of customers these products. The concentration of credit risk related to our JAKAFI, PEMAZYRE and OPZELURA product revenues is as follows:
| Percentage of Total Net Product Revenues for the Years Ended, December 31,
| 2023 |  | 2022 |  | 2021
Customer A | 16 | % |  | 19 | % |  | 18 | %
Customer B | 10 | % |  | 11 | % |  | 12 | %
Customer C | 18 | % |  | 18 | % |  | 18 | %
Customer D | 10 | % |  | 10 | % |  | 11 | %
Customer E | 12 | % |  | 14 | % |  | 8 | %
We are exposed to risks associated with extending credit to customers related to the sale of products. Customers A, B, C, D, and E comprised, in the aggregate, 40% and 41% of the accounts receivable balance as of December 31, 2023 and 2022, respectively. The concentration of credit risk relating to our other product revenues or accounts receivable is not significant. We assessed our collaborative and customer receivable assets as of December 31, 2023 according to our accounting policy for applying reserves for expected credit losses, noting minimal history of uncollectible receivables and the continued perceived creditworthiness of our third party sales relationships, upon which the expected credit losses were considered de minimis.

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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 -Topic 275 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//275/tableOfContent + Details
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