Quarterly report pursuant to Section 13 or 15(d)

FINANCIAL INSTRUMENTS AND SIGNIFICANT CONCENTRATIONS (Details)

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FINANCIAL INSTRUMENTS AND SIGNIFICANT CONCENTRATIONS (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Aug. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
FINANCIAL INSTRUMENTS AND SIGNIFICANT CONCENTRATIONS          
Cash, cash equivalents, and restricted cash $ 19,712 $ 19,700 $ 11,573 $ 258 $ 1,646