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GENERAL (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Jul. 26, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Net loss $ 37,066 $ 31,506 $ 20,163    
Accumulated deficit 308,242 270,965      
Net cash used in operating activities $ 30,658 $ 19,819 $ 25,607    
Research and Development Collaboration and Licensing Agreement          
Upfront payment received       $ 10,000  
Potential milestone compensation       500,000  
Potential milestone compensation company is now eligible for         $ 250,000
Preclinical milestone compensation       $ 30,000