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Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 16, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Warrants (Textual) |  |  |
Fair value of warrants on the issuance |  | $ (197) | $ 8
Loan and Security Agreement [Member] | Slipstream Communications, LLC [Member] |  |  |
Warrants (Textual) |  |  |
Revolving loan | $ 1,000 |  |
Interest rate per annum | 8.00% |  |
Maturity date | Jan. 16, 2019 |  |
Term of warrant | 5 years |  |
Warrant to purchase common stock | 1,851,852 |  |
Price per share | $ 0.27 |  |
Fair value of warrants on the issuance | $ 266 |  |

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