BASIS OF PRESENTATION - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
BASIS OF PRESENTATION
Cash and cash equivalents	$ 2,900	$ 2,330	$ 1,870	$ 1,156
Restricted cash - pledged deposits for performance bonds		3,807		3,768
Cash, cash equivalents and restricted cash shown in the statement of cash flows		$ 6,137		$ 4,924