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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operational gain (loss) recognized in earnings $ (5,254) $ (17,633)      
Payment of interest on acquisition liability note 0     $ 335  
Reimbursment of acquisition liability note 0        
Payment of deferred consideration 323     841  
Fair Value, Inputs, Level 3 [Member]          
Liability recorded upon acquisition (104,653)       $ (50,927)
Operational gain (loss) recognized in earnings     $ (60,503) (28,135) 18,993
Payment of interest on acquisition liability note     1,389    
Reimbursment of acquisition liability note     12,000    
Payment of deferred consideration     1,354    
Net carrying value (109,586)   (104,653)    
Deerfield Royalty Agreement [Member] | Fair Value, Inputs, Level 3 [Member]          
Liability recorded upon acquisition (6,837)     (2,600)  
Interest expense recognized in earnings (176)   (2,386) (1,990)  
Payment of royalty 39   140    
Net carrying value (6,974)   (6,837)   (2,600)
Broadfin Royalty Agreement [Member] | Fair Value, Inputs, Level 3 [Member]          
Liability recorded upon acquisition (3,259)     $ (2,187)  
Interest expense recognized in earnings (83)   (1,139)    
Payment of royalty 19   67    
Net carrying value $ (3,323)   $ (3,259)   $ (2,187)