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Fair value of financial instruments and investments - Schedule of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Aug. 23, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Marketable securities $ 398,535 $ 58,088  
Contingent consideration payable 356,300 310,240  
Fair Value, Measurements, Recurring | Total      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Marketable securities 398,535 58,088  
Equity Investment 6,194    
Stock appreciation rights liability 3,186 3,814  
Deferred consideration payable 40,000 37,700  
Contingent consideration payable   257,040  
Contingent consideration payable- net sales milestones and royalties   53,200  
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (level 1)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Marketable securities 0 0  
Equity Investment 6,194    
Stock appreciation rights liability 0 0  
Deferred consideration payable 0 0  
Contingent consideration payable   0  
Contingent consideration payable- net sales milestones and royalties   0  
Fair Value, Measurements, Recurring | Significant other observable inputs (level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Marketable securities 398,535 58,088  
Equity Investment 0    
Stock appreciation rights liability 0 0  
Deferred consideration payable 40,000 37,700  
Contingent consideration payable   0  
Contingent consideration payable- net sales milestones and royalties   0  
Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Marketable securities 0 0  
Equity Investment 0    
Stock appreciation rights liability 3,186 3,814  
Deferred consideration payable 0 0  
Contingent consideration payable   257,040  
Agilis      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Deferred consideration payable     $ 38,100
Agilis | Significant unobservable inputs (level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration payable- net sales milestones and royalties 65,800    
Agilis | Fair Value, Measurements, Recurring | Total      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration payable 290,500    
Contingent consideration payable- net sales milestones and royalties 65,800    
Agilis | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (level 1)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration payable 0    
Contingent consideration payable- net sales milestones and royalties 0    
Agilis | Fair Value, Measurements, Recurring | Significant other observable inputs (level 2)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration payable 0    
Contingent consideration payable- net sales milestones and royalties 0    
Agilis | Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration payable $ 290,500    
BioElectron | Fair Value, Measurements, Recurring | Significant unobservable inputs (level 3)      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration payable- net sales milestones and royalties   $ 53,200