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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 30, 2015
Sep. 19, 2014
Sep. 08, 2014
Jul. 31, 2014
Mar. 31, 2016
Dec. 31, 2014
Donoghue v. Retrophin, Inc. | Martin Shkreli            
Commitment And Contingency [Line Items]            
Litigation settlement   $ 2,025,000        
Damages sought         $ 5,000,000  
Legal fees         $ 2,700,000  
Donoghue v. Retrophin, Inc. | Martin Shkreli | Plaintiffs            
Commitment And Contingency [Line Items]            
Litigation settlement   $ 625,000        
Lease Agreement | California            
Commitment And Contingency [Line Items]            
Rent expense     $ 540,000      
Loss on leased assets           $ 200,000
Lease Agreement | Massachusetts            
Commitment And Contingency [Line Items]            
Rent expense       $ 815,000    
Lease Agreement | New York            
Commitment And Contingency [Line Items]            
Rent expense $ 550,000