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, 2015
Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Abstract]    
Accounts payable $ 1,045 $ 1,503
Severance and ad valorem tax payable 1,686 1,947
Payroll and other taxes 1,464 1,082
Accounts payable and accrued liabilities $ 4,195 $ 4,532