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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Tax Disclosure [Abstract] |  |  |
Net operating loss carryover | [1] | $ 3,594 | $ 874
Property and equipment |  | 4,306 | 7,123
Percentage depletion and contribution carryovers | [1] | 1,721 | 1,872
Alternative minimum tax credit carryover | [1] | 42 | 785
Equity method investment and other |  | 592 | 398
Deferred compensation liability |  | 9 | 8
Asset retirement obligations |  | 221 | 221
Stock-based compensation |  | 61 | 83
Total deferred tax assets |  | 10,546 | 11,364
Property and equipment |  |  |
Other |  |  | (3)
Total deferred tax liabilities |  |  | (3)
Net deferred tax assets |  | 10,546 | 11,361
Less valuation allowance |  | (10,546) | (11,361)
Net deferred tax asset |  |  |
[1] | In December 2017, the Company paid down debt through the issuance of common stock. This issuance represented a 49.3% ownership change in the Company. This change in ownership, combined with other equity events, triggered loss limitations under Internal Revenue Code ("I.R.C.") Section 382. As a result, the Company wrote-off $29.8 million of gross deferred tax assets in 2017, and an additional $2.4 million in gross deferred tax assets in 2018. Since the Company has maintained a valuation allowance against these tax assets there is no impact to the consolidated statement of operations in either year.

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