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Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Stockholders' Equity (Textual) |  |  |
Warrants to purchase common stock outstanding |  | 11,163,677 | 11,163,677
August 2017 Private Placement [Member] |  |  |
Stockholders' Equity (Textual) |  |  |
Issuance of common stock |  |  | 3,250,000
Common stock per share |  |  | $ 2.00
Cash proceeds from warrants |  |  | $ 6,500
Warrant, description |  |  | The 2017 Warrants will become exercisable 12 months from the date of issuance and will expire three years from the date of issuance.
Securities Purchase Agreement [Member] | August 2017 Private Placement [Member] |  |  |
Stockholders' Equity (Textual) |  |  |
Issuance of common stock | 9,750,000 |  |
Gross proceeds warrants for an aggregate purchase price | $ 9,750 |  |
Common stock per share | $ 1.00 |  |

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