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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities $ 707,049 $ 398,535
Contingent consideration payable 234,100 356,300
Recurring basis | Total    
Financial assets and liabilities measured at fair value on recurring basis    
Equity investment in ClearPoint 7,045 6,194
Stock appreciation rights liability   3,186
Deferred consideration payable 2,400 40,000
Contingent consideration payable 138,200 290,500
Contingent consideration payable- net sales milestones and royalties 95,900 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    
Equity investment in ClearPoint 7,045 6,194
Stock appreciation rights liability   0
Deferred consideration payable   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    
Equity investment in ClearPoint 0 0
Stock appreciation rights liability   0
Deferred consideration payable   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    
Equity investment in ClearPoint 0 0
Stock appreciation rights liability   3,186
Deferred consideration payable   0
Contingent consideration payable 138,200 290,500
Contingent consideration payable- net sales milestones and royalties 95,900 65,800
Marketable securities | Recurring basis | Total    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 707,049 398,535
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 0
Marketable securities | Recurring basis | Significant other observable inputs (level 2)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 707,049 398,535
Marketable securities | Recurring basis | Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 0 $ 0
Deferred consideration payable | Recurring basis | Total    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities 10,633  
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 10,633  
Deferred consideration payable | Recurring basis | Significant unobservable inputs (level 3)    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities $ 0