Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Summary of accounts payable and accrued liabilities
Accounts payable	$ 3,112	$ 790
Oil and gas revenue payable to oil and gas property owners	1,768	1,886
Production taxes payable	149	123
Drilling advances received from joint venture partner		537
Accrued drilling costs	289	75
Accrued lease operating costs	34	61
Accrued ad valorem taxes	844	596
Accrued general and administrative expenses	566	1,083
Other accrued liabilities	227	253
Total accounts payable and accrued liabilities	$ 6,989	$ 5,404