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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of Significant Accounting Policies (Textual) |  |  |
U.S federal corporate tax rate decreased |  | 34.00% | 34.00%
Additional potential warrants | $ 3 | $ 3 |
Estimated fair value of common stock price per share | $ 2.05 | $ 2.52 | $ 0.03
Maximum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |
U.S federal corporate tax rate decreased |  | 35.00% |
Minimum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |
U.S federal corporate tax rate decreased |  | 21.00% |

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