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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 1,881 $ 762
Payroll liabilities 1,928 835
Other accrued liabilities 4,112 4,852
Accounts payable and accrued liabilities $ 7,921 $ 6,449