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STOCKHOLDERS' EQUITY - COMMON STOCK RESERVED FOR FUTURE ISSUANCE (Details) - shares
Dec. 31, 2015
Dec. 31, 2014
STOCKHOLDERS' EQUITY    
Outstanding stock options (in shares) 17,205,683 16,958,944
Options and awards available for grant (in shares) 12,054,916 13,384,883
Warrants outstanding (in shares) 537,893  
Total (in shares) 30,740,857  
Employee Stock Purchase Plan    
STOCKHOLDERS' EQUITY    
Options and awards available for grant (in shares) 942,365