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Business Combinations - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 19, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 57,765 $ 57,765 $ 15,714
Progenics        
Business Acquisition [Line Items]        
Purchase price $ 419,009      
Fair value of bridge loan settled at close 10,074      
Acquired contingent receivable 10,100      
Goodwill $ 42,051      
Acquisition related costs   $ 1,600 $ 10,500  
Progenics | Discount rate        
Business Acquisition [Line Items]        
Measurement input   0.240 0.240