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SIGNIFICANT ACCOUNTING POLICIES - CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2014
SIGNIFICANT ACCOUNTING POLICIES        
Cash. $ 111 $ 23    
Money market funds 21,353 12,887    
Total cash and cash equivalents $ 21,464 $ 12,910 $ 14,920 $ 13,459
Marketable securities        
Minimum period for maturity dates 90 days      
Marketable securities $ 11,577