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FINANCIAL INSTRUMENTS AND SIGNIFICANT CONCENTRATIONS (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
FINANCIAL INSTRUMENTS AND SIGNIFICANT CONCENTRATIONS        
Cash, cash equivalents, and restricted cash $ 6,404 $ 9,955 $ 25,215 $ 11,573