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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.