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Fair Value of Financial Instruments - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]        
Company acquired right to receive certain future milestone $ 101,064,000 $ 66,010,000 $ 193,573,000 $ 156,714,000
Progenics Pharmaceuticals Inc        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Royalty percentage     0.05  
Potential payments, high 85,000,000.0   $ 85,000,000.0  
Progenics Pharmaceuticals Inc | Net Sales Targets For Azedra        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Potential payments, high 70,000,000.0   70,000,000.0  
Progenics Pharmaceuticals Inc | 1095 commercialization milestone        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Potential payments, high 5,000,000.0   5,000,000.0  
Progenics Pharmaceuticals Inc | 1404 Commercialization Milestone        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Business Combination, Contingent Consideration Arrangements, Range Of Outcomes Not Reasonably Possible, Value $ 10,000,000.0   10,000,000.0  
Royalty | Progenics Pharmaceuticals Inc        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Company acquired right to receive certain future milestone     $ 5,000,000.0