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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Organization (Details) - USD ($)
$ / shares in Units, $ in Millions
Jun. 03, 2020
Feb. 13, 2020
Jan. 10, 2020
May 20, 2020
May 19, 2020
NUCYNTA | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Business Acquisition [Line Items]          
Sale of disposal group, proceeds received   $ 375.0      
Gralise | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Business Acquisition [Line Items]          
Sale of disposal group, proceeds received $ 38.8   $ 75.0    
Sale of disposal group, total value     $ 130.3    
Consideration receivable as percentage of net sales after closing     75.00%    
Threshold for consideration receivable on net sales after closing     $ 70.0    
Considerable receivable, remaining balance 39.7        
Consideration receivable, reduction $ 0.9        
Zyla Life Sciences          
Business Acquisition [Line Items]          
Par value of common stock (in dollars per share)       $ 0.0001  
Assertio Therapeutics | Zyla Life Sciences          
Business Acquisition [Line Items]          
Par value of common stock (in dollars per share)         $ 0.0001