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Equity - Schedule of Stock based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |
Stock-based compensation | $ 707 | $ 324
General and administrative |  |
Class of Stock [Line Items] |  |
Stock-based compensation | 684 | 321
Research and development |  |
Class of Stock [Line Items] |  |
Stock-based compensation | $ 23 | $ 3

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