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Income Taxes - Schedule of Effective Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Income tax benefit at federal statutory rate |  | $ 472 | $ 4,801 | $ 31,585
State income tax benefit, net of federal impact |  | 38 | 292 | 1,440
Change in Federal tax rate, net of state benefit | [1] | (5,440) |  |
Loss on debt to equity conversion |  | (1,630) |  |
Effect of Sec. 382 Limitation |  | (29,803) |  |
Incentive stock options and restricted stock not deductible for tax purposes |  | 964 |  | (269)
Percentage depletion carryover |  | 138 | 19 |
Prior year true up |  | 1,076 | 534 | 171
Other |  | 77 |  |
Decrease in valuation allowance |  | (34,109) | (5,646) | (32,927)
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 US Statutory rate from 35% to 21%. We will continue to analyze the Tax Cuts and Jobs Act and future associated Treasury Regulations. This future analysis could potentially affect the measurement of deferred tax balances and give rise to new deferred tax amounts.

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