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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable $ 608 $ 620
Severance and ad valorem tax payable 2,518 1,218
Payroll and other taxes 554 505
Accounts payable and accrued liabilities $ 3,680 $ 2,343