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Shareholders' Equity (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2018 | Jan. 31, 2018 | Dec. 31, 2016 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2018
Proceeds from issuance of common stock |  |  |  |  |  |  |  | $ 1,150 |  |
Number of share issued |  |  |  |  |  |  |  | 930,857 |  |
Net share price |  |  |  |  | $ 1.37 |  |  | $ 1.37 |  |
Net proceeds from offering |  |  |  |  |  |  |  | $ 1,275 |  |
Warrant exercise price |  |  |  | $ 1.13 | $ 2.05 |  | $ 1.13 | $ 2.05 |  | $ 1.13
Fair value of warrants |  |  |  | $ 234 | $ (80) | [1] | $ 242 | $ 190 |  |
Warrant liability |  |  |  | 183 |  |  | 183 |  | $ 425 |
Stock-based compensation expense |  |  |  | 13 | $ 596 | [1] | 26 | $ 610 |  |
Unrecognized share based compensation |  |  |  | $ 19 |  |  | $ 19 |  |  |
Recognized share based compensation | $ 583 |  |  |  |  |  |  |  |  |
Unrestricted shares of common stock granted | 485,168 |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Number of share issued |  |  |  |  |  |  |  | 930,857 |  |
Market Offering [Member] |  |  |  |  |  |  |  |  |  |
Offering expenses |  |  |  |  |  |  |  | $ 125 |  |
Registered Direct Offering [Member] |  |  |  |  |  |  |  |  |  |
Number of share issued |  |  | 1,000,000 |  |  |  |  |  |  |
Net share price |  |  | $ 1.50 |  |  |  |  |  |  |
Proceeds from warrants |  |  | $ 1,320 |  |  |  |  |  |  |
Registered Direct Offering [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  | 1,000,000 |  |  |  |  |  |  |
Warrant exercise price |  |  | $ 2.05 |  |  |  |  |  |  |
Fair value of warrants |  |  | $ 1,240 |  |  |  |  |  |  |
Registered Direct Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Fair value of warrants |  |  | $ 80 |  |  |  |  |  |  |
Common Stock Sales Agreement [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 2,500 |  |  |  |  |  |  |  |
[1] | The condensed consolidated statement of operations for the three months ended June 30, 2018 was restated to exclude the loss on marketable equity securities of $78 thousand related to the three months ended March 31, 2018.

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