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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES.      
Cash and cash equivalents $ 1,600 $ 1,870 $ 1,577
Restricted cash - pledged deposits for performance bonds   3,797 3,732
Cash, cash equivalents and restricted cash shown in the statement of cash flows   $ 5,667 $ 5,309