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BASIS OF PRESENTATION - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
BASIS OF PRESENTATION      
Cash and cash equivalents $ 119,138 $ 50,315 $ 2,330
Restricted cash - pledged deposits for performance bonds     3,807
Cash, cash equivalents and restricted cash shown in the statement of cash flows $ 119,138   $ 6,137