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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 3,690 $ 7,044 $ 10,299 $ 6,203
Money Market Funds [Member]        
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 2,000