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STOCKHOLDERS' EQUITY - COMMON STOCK RESERVED FOR FUTURE ISSUANCE (Details) - shares
Dec. 31, 2017
Dec. 31, 2016
STOCKHOLDERS' EQUITY    
Outstanding stock options (in shares) 22,408,529 19,125,287
Options and awards available for grant (in shares) 6,202,727 9,570,535
Warrant outstanding (in shares) 537,893  
Common stock reserved for future issuance (in shares) 30,044,457  
Employee Stock    
STOCKHOLDERS' EQUITY    
Common stock reserved for future issuance (in shares) 895,308