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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue from External Customer [Line Items]      
Retained earnings $ (182,600,000)   $ (219,508,000)
Cash discount (as a percent) 2.00%    
Discount reimbursement period after filling of prescription subject to discount 1 month    
Zipsor      
Revenue from External Customer [Line Items]      
Product shelf-life 36 months    
Maximum      
Revenue from External Customer [Line Items]      
Receivables, collection period 2 months    
Product return period prior to expiration 6 months    
Period after expiration for accepting unsalable product 12 months    
Discount taken off period after the quarter in which product shipped to the customer 2 months    
Period after the quarter in which prescription is filled for paying rebate 3 months    
Managed care rebate, period after quarter in which prescription is filled 3 months    
Medicare Part D coverage gap rebate, period after quarter in which prescription is filled 3 months    
Maximum | Nucynta Er And Nucynta      
Revenue from External Customer [Line Items]      
Product shelf-life 36 months    
Maximum | Gralise      
Revenue from External Customer [Line Items]      
Product shelf-life 36 months    
Maximum | CAMBIA      
Revenue from External Customer [Line Items]      
Product shelf-life 48 months    
Maximum | Lazanda      
Revenue from External Customer [Line Items]      
Product shelf-life 36 months    
Minimum      
Revenue from External Customer [Line Items]      
Receivables, collection period 1 month    
Discount taken off period after the quarter in which product shipped to the customer 1 month    
Period after the quarter in which prescription is filled for paying rebate 2 months    
Managed care rebate, period after quarter in which prescription is filled 1 month    
Medicare Part D coverage gap rebate, period after quarter in which prescription is filled 2 months    
Minimum | Nucynta Er And Nucynta      
Revenue from External Customer [Line Items]      
Product shelf-life 24 months    
Minimum | Gralise      
Revenue from External Customer [Line Items]      
Product shelf-life 24 months    
Minimum | CAMBIA      
Revenue from External Customer [Line Items]      
Product shelf-life 24 months    
Minimum | Lazanda      
Revenue from External Customer [Line Items]      
Product shelf-life 24 months    
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606      
Revenue from External Customer [Line Items]      
Retained earnings   $ 0