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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedules of Concentration of Risk, by Risk Factor | The following table indicates the percentage of total revenues in excess of 10% with any single customer:
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Partner A |  | 44% |  | 46% |  | 48%
Partner B |  | 19% |  | 20% |  | 25%
Partner C |  | 10% |  | —% |  | —%
Partner D |  | —% |  | —% |  | 10%
We attribute revenues under collaborative agreements, including royalties, to the individual countries where the customer is headquartered. We attribute revenues from product sales to the individual countries to which the product is shipped. Worldwide revenues from external customers are summarized by geographic location in the following table (in thousands):
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
United States |  | $ | 587,196 |  |  | $ | 437,989 |  |  | $ | 293,089 |
Switzerland |  | 149,024 |  |  | 166,836 |  |  | 134,117 |
Belgium |  | 58,354 |  |  | 2,088 |  |  | 199 |
Japan |  | 15,096 |  |  | 47,939 |  |  | 11,934 |
All other foreign |  | 19,583 |  |  | 5,264 |  |  | 3,971 |
Total revenues |  | $ | 829,253 |  |  | $ | 660,116 |  |  | $ | 443,310 |

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