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Income Taxes - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax rate one time excluding adjustment |  | 16.00% |  |
Statutory tax rate |  | 27.60% | 34.00% | 34.00%
Blended income tax rate |  | 27.55% |  |
Deferred tax benefit | $ 6,100,000 | $ 5,949,389 | $ 0 | $ 0
Income tax rate percentage |  | (21.20%) | 37.60% | 28.00%
Unrecognized tax benefits |  | $ 0 | $ 0 | $ 0
Tax loss carryforwards from exercise of options and warrants |  |  |  | 25,300,000
Tax benefits related to stock-based compensation |  | 0 | $ 0 | $ 9,650,657
Mineral Property Depletion |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax carryforward |  | 1,100,000 |  |
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax loss carryforward from reverse merger |  | 1,200,000 |  |
Carryforward from reverse merger |  | 300,000 |  |
Annual amount of carryforward from reverse merger through 2023 |  | $ 39,648 |  |

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