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Stockholders' Equity (Detail Textuals 2) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 09, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Equity Offering [Line Items] |  |  |
Common stock, par value (in dollars per share) |  | $ 0.001 | $ 0.001
Proceeds from issuance of common stock, net of issuance costs |  | $ 6,794 | $ 11,061
Common Stock |  |  |
Equity Offering [Line Items] |  |  |
Number of common shares sold into underwriting agreement (in shares) |  |  | 833,333
Common Stock | March 2015 Public Offering |  |  |
Equity Offering [Line Items] |  |  |
Number of common shares sold into underwriting agreement (in shares) | 833,333 |  |
Share price per share | $ 12.00 |  |
Proceeds from issuance of common stock, net of issuance costs | $ 9,200 |  |

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