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Interim Period Reporting (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Interim Period Reporting (Textual) |  |  |  |  |  |
Net loss |  | $ (1,264) | $ (964) | $ (1,837) | $ (1,657) |
Accumulated deficit |  | $ (187,059) |  | (187,059) |  | $ (185,222)
Net cash used in operating activities |  |  |  | $ (1,475) | $ (1,431) |
Shelf registration common stock offering price | $ 20,000 |  |  |  |  |
Shelf registration statement expiration date | Mar. 24, 2020 |  |  |  |  |

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