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Income Taxes - Schedule of Effective Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax benefit at federal statutory rate |  | $ 218 | $ 472
State income tax benefit, net of federal impact |  | 37 | 38
Change in federal tax rate, net of state benefit | [1] |  | (5,440)
Change in state tax rate, net of federal benefit |  | (435) |
Loss on debt to equity conversion |  |  | (1,630)
Change in value of warrant |  | 163 |
Effect of Sec. 382 Limitation |  | (1,303) | (29,803)
Incentive stock options and restricted stock not deductible for tax purposes |  |  | 964
Percentage depletion carryover |  | 4 | 138
Prior year true up |  | 451 | 1,076
Other |  | 50 | 76
Decrease in valuation allowance |  | 815 | 34,109
Income tax benefit (expense) |  |  |
[1] | The change in the federal tax rate was due to the passage of Public Law 115-97 (Tax Cuts and Jobs Act). This resulted in a provisional reduction of the Company's deferred tax assets before valuation analysis primarily due to a reduction in the U.S. statutory rate from 35% to 21%.

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