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Significant Concentrations (Tables) | 12 Months Ended
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Dec. 31, 2017
Risks and Uncertainties [Abstract] |
Schedule of Company's Oil and Gas Sales | During the years ended December 31, 2017, 2016 and 2015, three joint interest operators accounted for the following percentages of the Company’s oil and gas sales:
Operator |  | 2017 |  |  | 2016 |  |  | 2015 |
A |  |  | 13 | % |  |  | 16 | % |  |  | 20 | %
B |  |  | 25 | % |  |  | 32 | % |  |  | 35 | %
C |  |  | 34 | % |  |  | 29 | % |  |  | 25 | %

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