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DEBT - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2020
USD ($)
May 20, 2020
USD ($)
numberOfSeries
Apr. 08, 2020
USD ($)
Jan. 01, 2020
USD ($)
Aug. 13, 2019
USD ($)
shares
Aug. 12, 2019
USD ($)
Apr. 02, 2015
USD ($)
Feb. 29, 2020
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Feb. 19, 2020
USD ($)
Sep. 09, 2014
USD ($)
Debt Instrument [Line Items]                                
Reduction in carrying amount of equity component                   $ 2,718,000 $ 16,814,000 $ 4,796,000        
Common Stock                                
Debt Instrument [Line Items]                                
Extinguishment of debt, shares issued (in shares) | shares         15.8                      
Senior Notes                                
Debt Instrument [Line Items]                                
Aggregate principal amount             $ 575,000,000.0                  
Proceeds from the issuance of debt             $ 562,000,000.0                  
Interest rate during the period                 11.65%     12.54%        
Repurchased aggregate principal amount               $ 162,500,000                
Payment of debt extinguishment               4,900,000         $ 171,775,000 $ 100,000,000    
Payment accrued exit fees               $ 4,400,000                
Loss on extinguishment of debt                 $ 0     $ 0 $ 8,233,000 0    
Senior Notes | Three month LIBOR                                
Debt Instrument [Line Items]                                
Basis spread             9.75%                  
Floor interest rate             1.00%                  
Interest rate through third anniversary of purchase date             11.95%                  
Interest rate after third anniversary of purchase date             12.95%                  
Senior Notes | NUCYNTA                                
Debt Instrument [Line Items]                                
Proceeds from the issuance of debt             $ 550,000,000.0                  
Senior Notes | 13% Senior Secured Note due 2024                                
Debt Instrument [Line Items]                                
Interest rate   13.00%             13.00%       13.00%      
Aggregate principal amount   $ 95,000,000.0                            
Number of series issued | numberOfSeries   2                            
Interest rate, outstanding principal   10.00%                            
Covenant, liquidity ratio quotient   9.5                            
Covenant, minimum liquidity ratio, amount   $ 7,500,000                            
Repayments of aggregate principal plus accrued interest $ 10,000,000.0                              
Senior Notes | 13% Senior Secured Note due 2024 | Debt Instrument, Redemption, Period One                                
Debt Instrument [Line Items]                                
Redemption price, percent   100.00%                            
Senior Notes | 13% Senior Secured Note due 2024 | Debt Instrument, Redemption, Period Two                                
Debt Instrument [Line Items]                                
Redemption price, percent   100.00%                            
Senior Notes | Secured Notes, Series A-1 Notes                                
Debt Instrument [Line Items]                                
Aggregate principal amount   $ 50,000,000.0                            
Senior Notes | Secured Notes, Series A-2 Notes                                
Debt Instrument [Line Items]                                
Aggregate principal amount   $ 45,000,000.0                            
Senior Notes | Royalty rights obligation                                
Debt Instrument [Line Items]                                
Royalty payments, percentage of revenue   1.50%                            
Royalty rights obligations                 $ 2,900,000       $ 2,900,000      
Senior Notes | Royalty rights obligation | Royalties, Current                                
Debt Instrument [Line Items]                                
Royalty rights obligations                 1,200,000       1,200,000      
Senior Notes | Royalty rights obligation | Royalties, Noncurrent                                
Debt Instrument [Line Items]                                
Royalty rights obligations                 1,700,000       1,700,000      
Convertible notes                                
Debt Instrument [Line Items]                                
Payment of debt extinguishment                         264,731,000 30,000,000    
Loss on extinguishment of debt                 $ 0     $ (26,385,000) $ 47,880,000 $ (26,385,000)    
Convertible notes | 2.50% Convertible Notes due 2021                                
Debt Instrument [Line Items]                                
Interest rate                 2.50%       2.50%     2.50%
Aggregate principal amount         $ 145,000,000.0                   $ 300,000 $ 345,000,000.0
Repurchased aggregate principal amount     $ 42,100,000                       102,500,000  
Debt extinguishment, amount         200,000,000.0                      
Extinguishment of debt, cash paid         30,000,000.0                      
Amortization of debt discount, debt issuance costs and royalty rights           $ 26,100,000                    
Unamortized balances of debt discount and debt issuance costs         18,900,000                      
Reduction in carrying amount of equity component           $ 6,200,000         300,000          
Carrying amount of equity component         $ 112,800,000                      
Loss on extinguishment of debt                   3,900,000 10,300,000          
Stock price trigger                 130.00%       130.00%      
Conversion price (in dollars per share) | $ / shares                 $ 19.24       $ 19.24      
Convertible notes | 5.0% Convertible Notes debt 2024                                
Debt Instrument [Line Items]                                
Interest rate         5.00%       5.00%       5.00%      
Aggregate principal amount         $ 120,000,000.0                      
Redemption price, percent     99.50%                          
Repurchased aggregate principal amount     $ 34,500,000                       $ 85,500,000  
Reduction in carrying amount of equity component       $ (19,500,000)           2,700,000 16,800,000          
Loss on extinguishment of debt                   $ 12,400,000 $ 21,300,000