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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
CASH AND CASH EQUIVALENTS.        
Cash.   $ 111    
Cash $ (90)      
Money market funds 16,524 21,353    
Total cash and cash equivalents $ 16,434 $ 21,464 $ 25,261 $ 14,920