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MARKETABLE SECURITIES, CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
MARKETABLE SECURITIES.    
Cash $ 23 $ 111
Money market funds 12,887 21,353
Marketable securities   11,577
Total cash, cash equivalents and marketable securities $ 12,910 $ 33,041
Minimum original maturity of investment portfolio 90 days