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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities $ 340,430 $ 398,535
Contingent consideration payable 225,700 356,300
Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable- net sales milestones and royalties 89,600  
Recurring basis | Total    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities   398,535
Equity investment in ClearPoint 4,594 6,194
Stock appreciation rights liability   3,186
Deferred consideration payable 2,384 40,000
Contingent consideration payable 136,100 290,500
Contingent consideration payable- net sales milestones and royalties 89,600 65,800
Recurring basis | Quoted prices in active markets for identical assets (level 1)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities   0
Equity investment in ClearPoint 4,594 6,194
Stock appreciation rights liability   0
Deferred consideration payable 0 0
Contingent consideration payable 0 0
Contingent consideration payable- net sales milestones and royalties 0 0
Recurring basis | Significant other observable inputs (level 2)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities   398,535
Equity investment in ClearPoint 0 0
Stock appreciation rights liability   0
Deferred consideration payable 2,384 40,000
Contingent consideration payable 0 0
Contingent consideration payable- net sales milestones and royalties 0 0
Recurring basis | Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities   0
Equity investment in ClearPoint 0 0
Stock appreciation rights liability   3,186
Deferred consideration payable 0 0
Contingent consideration payable 136,100 $ 290,500
Marketable securities | Recurring basis | Total    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 340,430  
Marketable securities | Recurring basis | Quoted prices in active markets for identical assets (level 1)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 0  
Marketable securities | Recurring basis | Significant other observable inputs (level 2)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 340,430  
Marketable securities | Recurring basis | Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 0  
Deferred consideration payable | Recurring basis | Total    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 9,251  
Deferred consideration payable | Recurring basis | Quoted prices in active markets for identical assets (level 1)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 0  
Deferred consideration payable | Recurring basis | Significant other observable inputs (level 2)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 9,251  
Deferred consideration payable | Recurring basis | Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities $ 0