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Fair value measurements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Liabilities [Abstract]    
Payment of contingent obligations  
Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period $ 41,086 $ 16,619
Expense (income) included in earnings (10,599) 3,133
Settlements (5,693) (1,579)
Purchases, sales and issuances 805 22,913
Transfers in/(out) of Level 3 0 0
Balance, end of period 25,599 41,086
RSDL and HepaGam [Member]    
Liabilities [Abstract]    
Fair value adjustment for contingent obligations (1,200) 3,100
Fair Value, Measurements, Recurring [Member]    
Assets [Abstract]    
Investment in money market funds [1] 3,323 8,069
Total assets 3,323 8,069
Liabilities [Abstract]    
Contingent price consideration 25,599 41,086
Total liabilities 25,599 41,086
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets [Abstract]    
Investment in money market funds [1] 3,323 8,069
Total assets 3,323 8,069
Liabilities [Abstract]    
Contingent price consideration 0 0
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets [Abstract]    
Investment in money market funds [1] 0 0
Total assets 0 0
Liabilities [Abstract]    
Contingent price consideration 0 0
Total liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets [Abstract]    
Investment in money market funds [1] 0 0
Total assets 0 0
Liabilities [Abstract]    
Contingent price consideration 25,599 41,086
Total liabilities $ 25,599 $ 41,086
[1] Included in cash and cash equivalents in accompanying consolidated balance sheets.