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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 483 $ 2,033
Payroll liabilities 432 1,588
Other accrued liabilities 2,406 1,817
Accounts payable and accrued liabilities $ 3,321 $ 5,438