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Summary of Significant Accounting Policies (Tables)
12 Months Ended
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,
202320222021
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,
202320222021
United States$587,196 $437,989 $293,089 
Switzerland149,024 166,836 134,117 
Belgium58,354 2,088 199 
Japan15,096 47,939 11,934 
All other foreign19,583 5,264 3,971 
Total revenues$829,253 $660,116 $443,310