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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basis of Presentation      
Number of operating segments 1    
Revenue | Customer concentration | Glaxo
     
Concentration risk      
Concentration risk (as a percent) 57.00% 96.00% 98.00%