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Fair value measurements (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Unobservable Input Reconciliation [Roll Forward]      
Balance, beginning of period $ 25,599,000    
Expense included in earnings 847,000    
Settlements (752,000)    
Purchases, sales and issuances 0    
Transfers in/(out) of Level 3 0    
Balance, end of period 25,694,000    
Evolva Holding SA 035 & Broad Spectrum Antiviral Platform [Member]      
Unobservable Input Reconciliation [Roll Forward]      
Change in fair value of contingent obligations 100,000 $ 800,000  
EV-035 & Broad Spectrum Antiviral Platform Research and Development [Member]      
Unobservable Input Reconciliation [Roll Forward]      
Change in fair value of contingent obligations 100,000 500,000  
EV-035&Broad Spectrum Antiviral Platform Selling, General and Administrative Member [Member]      
Unobservable Input Reconciliation [Roll Forward]      
Change in fair value of contingent obligations   300,000  
RSDL and HepaGam [Member]      
Unobservable Input Reconciliation [Roll Forward]      
Change in fair value of contingent obligations 789,000 $ 800,000  
Fair Value, Measurements, Recurring [Member]      
Assets:      
Investment in money market funds (1) [1] 234,000   $ 3,323,000
Total assets 234,000   3,323,000
Liabilities:      
Contingent consideration 25,694,000   25,599,000
Total liabilities 25,694,000   25,599,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Assets:      
Investment in money market funds (1) [1] 234,000   3,323,000
Total assets 234,000   3,323,000
Liabilities:      
Contingent consideration 0   0
Total liabilities 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Assets:      
Investment in money market funds (1) [1] 0   0
Total assets 0   0
Liabilities:      
Contingent consideration 0   0
Total liabilities 0   0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Assets:      
Investment in money market funds (1) [1] 0   0
Total assets 0   0
Liabilities:      
Contingent consideration 25,694,000   25,599,000
Total liabilities $ 25,694,000   $ 25,599,000
[1] Included in cash and cash equivalents in accompanying consolidated balance sheets