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CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CASH AND CASH EQUIVALENTS.        
Cash in bank $ 14,264 $ 6,471    
Short-term bank deposits 15,031 22,552    
Cash and cash equivalents $ 29,295 $ 29,023 $ 29,005 $ 16,455