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Income Taxes (Details 2) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Income tax (expense) benefit at federal statutory rate |  |  | 21.00% | 34.00% | 34.00% | 34.00%
State and local taxes |  |  |  |  | (2.60%) | 11.00%
Federal tax reform |  |  |  |  | (55.00%) |
Valuation allowance |  |  |  |  | 25.30% | 185.70%
Payable true-up |  |  |  |  | (3.80%) |
Other |  |  |  |  | (1.90%) | (0.80%)
NOL adjustment |  |  |  |  |  | (229.90%)
Effective tax rate | 0.80% | 0.00% | 0.56% | 0.00% | (4.00%) | 0.00%

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