Quarterly report pursuant to Section 13 or 15(d)

Accounts Payable and Accrued Liabilities (Details)

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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable $ 642 $ 840
Severance and ad valorem tax payable 1,317 1,224
Payroll and other taxes 695 975
Accounts payable and accrued liabilities $ 2,654 $ 3,039