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Long-Term Related Party Payable - Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Acquisition-related contingent consideration:      
Related party payable, beginning balance $ 28,840 $ 98,925  
Payments to Related Parties (3,688) (7,017)  
Operating Expense 2,134 2,968  
Other Expense 307    
Related party payable, ending balance 27,593 $ 72,767  
Less: Current portion (9,391)   $ (9,439)
Long-term related party payable 18,202   $ 19,401
Acquisition-related contingent consideration: | Earn-out payments      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 25,615    
Payments to Related Parties (3,180)    
Operating Expense 2,134    
Other Expense 0    
Related party payable, ending balance 24,569    
Financing-related: | Royalty agreement - Deerfield      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 2,184    
Payments to Related Parties (344)    
Operating Expense 0    
Other Expense 208    
Related party payable, ending balance 2,048    
Financing-related: | Royalty agreement - Broadfin      
Acquisition-related contingent consideration:      
Related party payable, beginning balance 1,041    
Payments to Related Parties (164)    
Operating Expense 0    
Other Expense 99    
Related party payable, ending balance $ 976