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Business Combinations - Narrative (Details)
$ in Thousands
3 Months Ended
Jun. 19, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]      
Goodwill   $ 61,189 $ 58,632
Progenics      
Business Acquisition [Line Items]      
Purchase price $ 419,009    
Fair value of bridge loan settled at close 10,074    
Measurement period adjustment   $ 2,600  
Acquired contingent receivable 10,100    
Goodwill $ 45,475    
Progenics | Discount rate      
Business Acquisition [Line Items]      
Measurement input   0.230