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Collaboration Agreements And Business Development Activities (Tables)
 6 Months Ended
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Collaborative Revenues Under Collaboration and License Agreement
Revenues under the collaboration and license agreement, as amended, with Ipsen were as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
License revenues$34,018 $51,168 $63,830 $75,782 
Collaboration services revenues2,713 11,072 6,435 20,985 
Total collaboration revenues$36,731 $62,240 $70,265 $96,767 
Revenues under the collaboration and license agreement, as amended, with Takeda were as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
License revenues$11,362 $2,700 $14,211 $5,065 
Collaboration services revenues4,742 3,785 8,116 7,487 
Total collaboration revenues$16,104 $6,485 $22,327 $12,552