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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - available for sale $ 472,338 $ 894,838
Marketable securities - equity investments 23,000 20,500
ClearPoint convertible debt security 31,300 29,300
Contingent consideration payable 252,000 240,400
Recurring basis    
Financial assets and liabilities measured at fair value on recurring basis    
ClearPoint Equity Investments 22,979 20,503
ClearPoint convertible debt security 31,306 29,252
Recurring basis | Level 1    
Financial assets and liabilities measured at fair value on recurring basis    
ClearPoint Equity Investments 22,979 20,503
Recurring basis | Level 2    
Financial assets and liabilities measured at fair value on recurring basis    
ClearPoint convertible debt security 31,306 29,252
Recurring basis | Development and Regulatory Milestone    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 140,200 139,200
Recurring basis | Development and Regulatory Milestone | Level 3    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 140,200 139,200
Recurring basis | Net Sales Milestones and Royalties    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 111,800 101,200
Recurring basis | Net Sales Milestones and Royalties | Level 3    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 111,800 101,200
Recurring basis | Marketable securities    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - available for sale 472,338 894,838
Marketable securities - equity investments 205,787  
Recurring basis | Marketable securities | Level 1    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - equity investments 205,787  
Recurring basis | Marketable securities | Level 2    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - available for sale $ 472,338 $ 894,838