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STOCKHOLDERS' EQUITY - COMMON STOCK RESERVED FOR FUTURE ISSUANCE (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
STOCKHOLDERS' EQUITY    
Outstanding stock options (in shares) 27,285,952 22,408,529
Options and awards available for grant (in shares) 11,964,399 6,202,727
Warrant outstanding (in shares) 537,893  
Common stock reserved for future issuance (in shares) 40,665,152  
Employee Stock    
STOCKHOLDERS' EQUITY    
Common stock reserved for future issuance (in shares) 876,908