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SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts payable $ 762 $ 1,150
Payroll liabilities 835 1,374
Other accrued liabilities 4,852 3,232
Accounts payable and accrued liabilities $ 6,449 $ 5,756