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Unaudited Supplemental Oil and Gas Information - Schedule of Standardized Measure of Future Net Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Oil and Gas Exploration and Production Industries Disclosures [Abstract] |  |
Standardized measure, beginning of year | $ 9,253 | $ 6,747
Sales of oil and natural gas, net of production costs | (3,235) | (3,143)
Net changes in prices and production costs | 3,419 | 2,347
Changes in estimated future development costs |  |
Extensions and discoveries | 1,912 | 511
Sale of minerals in place |  | (1,049)
Revisions in previous quantity estimates | 761 | 3,416
Previously estimated development costs incurred |  |
Net changes in income taxes | (1,425) |
Accretion of discount | 925 | 675
Changes in timing and other | (11) | (251)
Standardized measure, end of year | $ 11,599 | $ 9,253

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