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Stockholders' Equity (Detail Textuals 1) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 23, 2016 | Dec. 31, 2017
Stockholders' equity |  |
Sale of stock, value |  | $ 13,684
FBR (the "FBR Sales Agreement") |  |
Stockholders' equity |  |
Percentage of commission on gross equity sales | 3.00% |
Number of common stock issued |  | 183,118
Sale of stock, value |  | $ 1,100

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