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License Agreements - Merus (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2023
USD ($)
Jan. 31, 2022
item
Dec. 31, 2016
item
Mar. 31, 2023
USD ($)
shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
License Agreements            
Unrealized gain (loss) on long term investments       $ (5,318) $ (46,585)  
Merus            
License Agreements            
Common stock held from investment (in shares) | shares       3,600,000    
Fair market value of our long term investments       $ 65,300   $ 54,900
Unrealized gain (loss) on long term investments       10,400 $ (19,000)  
Merus            
License Agreements            
Number of independent programs | item     10      
Number of additional preclinical discovery programs | item   10        
Number of programs under the resulting products are co-funded for development | item   2        
Associated future global development costs , if elected to co-develop (as a percent)   35.00%        
Milestone payment made under license agreement $ 2,500     $ 5,500    
Merus | UNITED STATES            
License Agreements            
Profit sharing (as a percent)       50.00%    
Percentage of profit (losses)       50.00%    
Merus | Minimum            
License Agreements            
Royalty payments on future global net sales (as a percent)       6.00%    
Merus | Minimum | Non-US            
License Agreements            
Royalty payments on future global net sales (as a percent)       6.00%    
Merus | Maximum            
License Agreements            
Royalty payments on future global net sales (as a percent)       10.00%    
Merus | Maximum | UNITED STATES            
License Agreements            
Royalty payments on future global net sales (as a percent)       4.00%    
Merus | Maximum | Non-US            
License Agreements            
Royalty payments on future global net sales (as a percent)       10.00%    
Merus | Development and Regulatory Milestones | Maximum            
License Agreements            
Additional milestone payments under the license agreement       $ 100,000    
Merus | Commercialization Milestones | Maximum            
License Agreements            
Additional milestone payments under the license agreement       $ 250,000