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Long-Term Related Party Payable - Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Long-Term Related Party Payable      
Related party payable, beginning balance $ 169,347 $ 122,693 $ 114,750
Payments to Related Parties (37,311) (30,838) (27,897)
Changes in Fair Value of Related Party Payable, Operating Income (31,040) 49,285 30,957
Changes in Fair Value of Related Party Payable, Other Income (2,071)    
Related party payable, ending balance 98,925 169,347 $ 122,693
Less: Current portion (25,007) (34,177)  
Total long-term related party payable 73,918 135,170  
Financing-related:      
Long-Term Related Party Payable      
Related party payable, beginning balance 15,000    
Payments to Related Parties 0    
Changes in Fair Value of Related Party Payable, Operating Income 0    
Changes in Fair Value of Related Party Payable, Other Income 0    
Related party payable, ending balance 15,000 15,000  
Warrant | Acquisition-related contingent consideration:      
Long-Term Related Party Payable      
Related party payable, beginning balance 11,217    
Payments to Related Parties 0    
Changes in Fair Value of Related Party Payable, Operating Income (8,738)    
Changes in Fair Value of Related Party Payable, Other Income 0    
Related party payable, ending balance 2,479 11,217  
Earn-out payments | Acquisition-related contingent consideration:      
Long-Term Related Party Payable      
Related party payable, beginning balance 121,377    
Payments to Related Parties (31,636)    
Changes in Fair Value of Related Party Payable, Operating Income (21,997)    
Changes in Fair Value of Related Party Payable, Other Income 0    
Related party payable, ending balance 67,744 121,377  
Royalty agreement - FSC | Acquisition-related contingent consideration:      
Long-Term Related Party Payable      
Related party payable, beginning balance 7,291    
Payments to Related Parties (1,246)    
Changes in Fair Value of Related Party Payable, Operating Income (305)    
Changes in Fair Value of Related Party Payable, Other Income 0    
Related party payable, ending balance 5,740 7,291  
Royalty agreement - Deerfield | Financing-related:      
Long-Term Related Party Payable      
Related party payable, beginning balance 9,794    
Payments to Related Parties (2,999)    
Changes in Fair Value of Related Party Payable, Operating Income 0    
Changes in Fair Value of Related Party Payable, Other Income (1,403)    
Related party payable, ending balance 5,392 9,794  
Royalty agreement - Broadfin | Financing-related:      
Long-Term Related Party Payable      
Related party payable, beginning balance 4,668    
Payments to Related Parties (1,430)    
Changes in Fair Value of Related Party Payable, Operating Income 0    
Changes in Fair Value of Related Party Payable, Other Income (668)    
Related party payable, ending balance $ 2,570 $ 4,668