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Long-Term Related Party Payable - Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Acquisition-related contingent consideration:      
Related party payable, beginning balance $ 98,925 $ 169,347  
Payments to Related Parties (7,017) (8,613)  
Changes in Fair Value of Related Party Payable, Operating Expense 2,968 (6,971)  
Changes in Fair Value of Related Party Payable, Other Expense 395    
Warrant Exercise (2,167)    
Disposal 20,337    
Related party payable, ending balance 72,767 $ 153,213  
Less: Current portion (21,121)   $ (25,007)
Long-term related party payable 51,646   $ 73,918
Acquisition-related contingent consideration: | Warrants      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 2,479    
Payments to Related Parties 0    
Changes in Fair Value of Related Party Payable, Operating Expense (312)    
Changes in Fair Value of Related Party Payable, Other Expense 0    
Warrant Exercise (2,167)    
Disposal 0    
Related party payable, ending balance 0    
Acquisition-related contingent consideration: | Earn-out payments      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 67,744    
Payments to Related Parties (5,790)    
Changes in Fair Value of Related Party Payable, Operating Expense 3,029    
Changes in Fair Value of Related Party Payable, Other Expense 0    
Warrant Exercise 0    
Disposal 0    
Related party payable, ending balance 64,983    
Acquisition-related contingent consideration: | Royalty agreement - FSC      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 5,740    
Payments to Related Parties (402)    
Changes in Fair Value of Related Party Payable, Operating Expense 251    
Changes in Fair Value of Related Party Payable, Other Expense 0    
Warrant Exercise 0    
Disposal (5,337)    
Related party payable, ending balance 252    
Financing-related:      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 15,000    
Payments to Related Parties 0    
Changes in Fair Value of Related Party Payable, Operating Expense 0    
Changes in Fair Value of Related Party Payable, Other Expense 0    
Warrant Exercise 0    
Disposal (15,000)    
Related party payable, ending balance 0    
Financing-related: | Royalty agreement - Deerfield      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 5,392    
Payments to Related Parties (559)    
Changes in Fair Value of Related Party Payable, Operating Expense 0    
Changes in Fair Value of Related Party Payable, Other Expense 268    
Warrant Exercise 0    
Disposal 0    
Related party payable, ending balance 5,101    
Financing-related: | Royalty agreement - Broadfin      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 2,570    
Payments to Related Parties (266)    
Changes in Fair Value of Related Party Payable, Operating Expense 0    
Changes in Fair Value of Related Party Payable, Other Expense 127    
Warrant Exercise 0    
Disposal 0    
Related party payable, ending balance $ 2,431