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FAIR VALUES OF ASSETS AND LIABILITIES (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets and liabilities measured at fair value on a recurring basis    
Cash equivalents $ 6,617 $ 16,743
Level 1    
Assets and liabilities measured at fair value on a recurring basis    
Cash equivalents $ 6,617 $ 16,743