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DEBT - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 04, 2017
Apr. 02, 2015
Sep. 09, 2014
Apr. 30, 2019
Jan. 31, 2019
Apr. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2018
Debt Instrument [Line Items]                      
Payment of a prepayment fee             $ 3,249,000 $ 0      
Senior Notes                      
Debt Instrument [Line Items]                      
Aggregate principal amount of notes issued   $ 575,000,000         $ 257,500,000        
Proceeds from the issuance of debt   562,000,000                  
Debt issuance costs                   $ 500,000  
Effective interest rate             12.54% 11.45%      
Amount of debt prepaid   $ 10,000,000       $ 100,000,000          
Payment of a prepayment fee $ 400,000         $ 4,000,000     $ 4,400,000    
Loss on prepayment of debt                 5,900,000    
Unamortized balances of debt discount and debt issuance costs                 $ 1,500,000    
Amendment fee         $ 3,200,000            
Principal payments             $ 115,000,000        
Senior Notes | Subsequent Event                      
Debt Instrument [Line Items]                      
Principal payment       $ 55,000,000              
Senior Notes | Period One                      
Debt Instrument [Line Items]                      
Prepayment premium         3.00%            
Senior Notes | Period Two                      
Debt Instrument [Line Items]                      
Prepayment premium         1.00%            
Senior Notes | Three month LIBOR                      
Debt Instrument [Line Items]                      
Basis spread   9.75%                  
Interest rate through third anniversary   11.95%                  
Interest rate after third anniversary   12.95%                  
Senior Notes | Three month LIBOR | Minimum                      
Debt Instrument [Line Items]                      
Interest rate   1.00%                  
Senior Notes | NUCYNTA                      
Debt Instrument [Line Items]                      
Proceeds from the issuance of debt   $ 550,000,000                  
Convertible debt                      
Debt Instrument [Line Items]                      
Aggregate principal amount of notes issued     $ 345,000,000               $ 345,000,000
Interest rate     2.50%                
Net proceeds from debt offering     $ 334,200,000                
Underwriting discount     10,400,000                
Offering expenses     $ 400,000                
Stock price trigger             130.00%        
Conversion price (in dollars per share)             $ 19.24