Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 3,923	$ 3,274
Oil and gas revenue suspense	2,111	1,776
Gathering and transportation payables	817	497
Production taxes payable	375	214
Drilling advances received from joint venture partner	295	245
Accrued lease operating expenses	946	684
Accrued ad valorem taxes-current	1,704	1,054
Accrued general and administrative expenses	1,085	2,473
Accrued asset retirement obligation-current	902	380
Accrued interest	633	247
Accrued environmental liability	728
Other liabilities	859	374
Total accounts payable and accrued liabilities	$ 14,378	$ 11,218