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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY AND EQUIPMENT (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 01, 2017
Apr. 02, 2015
Oct. 31, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2016
Sep. 09, 2014
Advertising Costs                
Advertising expense       $ 3,700 $ 4,100 $ 2,300    
Cash discount (as a percent)       2.00%        
Discount reimbursement period after filling of prescription subject to discount       1 month        
Recently Issued Accounting Standards                
Deferred tax assets related to share-based compensation       $ 1,505 4,992      
Valuation allowance for deferred tax assets       $ 54,224 45,206      
ASU 2016-09                
Recently Issued Accounting Standards                
Accumulated deficit $ (300)              
Deferred tax assets related to share-based compensation         5,800      
Valuation allowance for deferred tax assets         $ 5,800      
Minimum                
Advertising Costs                
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        
Minimum | Managed Care Rebates                
Advertising Costs                
Period after the quarter in which prescription is filled for rebate       1 month        
Minimum | Medicare Part D Coverage Gap Rebates                
Advertising Costs                
Period after the quarter in which prescription is filled for rebate       2 months        
Maximum                
Advertising Costs                
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        
Maximum | Managed Care Rebates                
Advertising Costs                
Period after the quarter in which prescription is filled for rebate       3 months        
Maximum | Medicare Part D Coverage Gap Rebates                
Advertising Costs                
Period after the quarter in which prescription is filled for rebate       3 months        
NUCYNTA ER | Minimum                
Advertising Costs                
Product shelf-life       24 months        
NUCYNTA ER | Maximum                
Advertising Costs                
Product shelf-life       36 months        
Gralise | Minimum                
Advertising Costs                
Product shelf-life       24 months        
Gralise | Maximum                
Advertising Costs                
Product shelf-life       36 months        
CAMBIA | Minimum                
Advertising Costs                
Product shelf-life       24 months        
CAMBIA | Maximum                
Advertising Costs                
Product shelf-life       48 months        
Zipsor                
Advertising Costs                
Product shelf-life       36 months        
Lazanda | Minimum                
Advertising Costs                
Product shelf-life       24 months        
Lazanda | Maximum                
Advertising Costs                
Product shelf-life       36 months        
Furniture and office equipment | Minimum                
Property and Equipment                
Estimated useful lives       3 years        
Furniture and office equipment | Maximum                
Property and Equipment                
Estimated useful lives       5 years        
Machinery and Equipment | Minimum                
Property and Equipment                
Estimated useful lives       5 years        
Machinery and Equipment | Maximum                
Property and Equipment                
Estimated useful lives       7 years        
Laboratory equipment | Minimum                
Property and Equipment                
Estimated useful lives       3 years        
Laboratory equipment | Maximum                
Property and Equipment                
Estimated useful lives       5 years        
Convertible Notes                
Summary Of Significant Accounting Policies                
Aggregate principal amount of notes issued       $ 345,000       $ 345,000
Senior Notes                
Summary Of Significant Accounting Policies                
Aggregate principal amount of notes issued   $ 575,000         $ 365,000  
Proceeds from the issuance of debt   $ 562,000            
Liability related to sale of future royalties | PDL BioPharma                
Summary Of Significant Accounting Policies                
Royalty and milestone payments received     $ 240,500