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Business Combination - Allocation of Purchase Price (Details) - USD ($)
$ in Thousands
Jan. 04, 2019
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 137,823 $ 0
SVB Leerink      
Business Acquisition [Line Items]      
Cash paid (1) $ 265,601    
Replacement award liabilities 7,629    
Total purchase price 273,230    
Fair value of net assets acquired 135,407    
Goodwill $ 137,823