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Organization of the Company and Basis of Presentation (Details Textuals) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 27, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Organization Of Company And Basis Of Presentation Line Items |  |  |  |
Net loss |  | $ (11,791) | $ (14,342) |
Accumulated deficit |  | (335,039) | (323,159) |
Cash and cash equivalents |  | $ 16,520 | $ 20,440 | $ 24,189
Stockholders' equity, Reverse stock split | one-for-twelve |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001 |
Common stock, shares outstanding (in shares) |  | 4,256,829 | 2,965,208 |
Before Reverse Stock Split |  |  |  |
Organization Of Company And Basis Of Presentation Line Items |  |  |  |
Common stock, shares outstanding (in shares) | 36,075,730 |  |  |
After Reverse Stock Split |  |  |  |
Organization Of Company And Basis Of Presentation Line Items |  |  |  |
Common stock, shares outstanding (in shares) | 3,006,311 |  |  |

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