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Fair Value of Financial Instruments - Narrative (Details)
$ in Thousands
12 Months Ended
Feb. 20, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 19, 2020
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]          
Revenues   $ 425,208 $ 339,410 $ 347,337  
Contingent consideration liabilities   $ 86,200 $ 15,800    
Progenics Pharmaceuticals          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Royalty percentage   0.05      
Potential payments, high   $ 85,000      
Progenics Pharmaceuticals | Net Sales Targets For Azedra          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Potential payments, high   70,000      
Progenics Pharmaceuticals | 1095 commercialization milestone          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Potential payments, high   5,000      
Progenics Pharmaceuticals | 1404 Commercialization Milestone          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Potential payment not reasonably possible   10,000      
Progenics          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Aggregate cash payments percentage 40.00%        
Contingent consideration liabilities         $ 3,700
Progenics | Cash Payments, 2022          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Contingent consideration liabilities $ 100,000        
Progenics | Cash Payments, 2023          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Contingent consideration liabilities $ 150,000        
Royalty | Progenics Pharmaceuticals          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Revenues   $ 5,000