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Fair value of financial instruments and marketable securities - Hierarchy (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Aug. 23, 2018
Financial assets and liabilities measured at fair value on recurring basis      
Marketable securities $ 185,072 $ 58,088  
Deferred consideration payable 19,300 18,300  
Contingent consideration payable 344,900 310,240  
Recurring basis | Total      
Financial assets and liabilities measured at fair value on recurring basis      
Marketable securities 185,072 58,088  
Equity Securities, FV-NI 6,529    
Stock appreciation rights liability 2,235 3,814  
Deferred consideration payable 39,000 37,700  
Contingent consideration payable 285,300 257,040  
Contingent consideration payable- net sales milestones and royalties 59,600 53,200  
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  
Equity Securities, FV-NI 6,529    
Stock appreciation rights liability 0 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 185,072 58,088  
Stock appreciation rights liability 0 0  
Deferred consideration payable 39,000 37,700  
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 0  
Stock appreciation rights liability 2,235 3,814  
Deferred consideration payable 0 0  
Contingent consideration payable 285,300 257,040  
Agilis      
Financial assets and liabilities measured at fair value on recurring basis      
Deferred consideration payable     $ 38,100
Agilis | Significant unobservable inputs (level 3)      
Financial assets and liabilities measured at fair value on recurring basis      
Contingent consideration payable- net sales milestones and royalties $ 59,600 $ 53,200