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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - available for sale $ 642,077 $ 894,838
Marketable securities - equity investments 27,400 20,500
ClearPoint convertible debt security 37,100 29,300
Contingent consideration payable 240,500 240,400
Recurring basis    
Financial assets and liabilities measured at fair value on recurring basis    
ClearPoint Equity Investments 27,367 20,503
ClearPoint convertible debt security 37,109 29,252
Recurring basis | Level 1    
Financial assets and liabilities measured at fair value on recurring basis    
ClearPoint Equity Investments 27,367 20,503
Recurring basis | Level 2    
Financial assets and liabilities measured at fair value on recurring basis    
ClearPoint convertible debt security 37,109 29,252
Recurring basis | Development and Regulatory Milestone    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 139,300 139,200
Recurring basis | Development and Regulatory Milestone | Level 3    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 139,300 139,200
Recurring basis | Net Sales Milestones and Royalties    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 101,200 101,200
Recurring basis | Net Sales Milestones and Royalties | Level 3    
Financial assets and liabilities measured at fair value on recurring basis    
Contingent consideration payable 101,200 101,200
Recurring basis | Marketable securities    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - available for sale 642,077 894,838
Marketable securities - equity investments 199,697  
Recurring basis | Marketable securities | Level 1    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - equity investments 199,697  
Recurring basis | Marketable securities | Level 2    
Financial assets and liabilities measured at fair value on recurring basis    
Marketable securities - available for sale $ 642,077 $ 894,838