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Stockholders' Equity (Detail Textuals 3) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 14, 2013 | Dec. 31, 2016 | Dec. 31, 2015
Equity Offering [Line Items] |  |  |
Proceeds from issuance of common stock, net of issuance costs |  | $ 6,794 | $ 11,061
November 2013 Stock Purchase Agreement | Common Stock | Aspire Capital Fund, LLC |  |  |
Equity Offering [Line Items] |  |  |
Number of shares issued under purchase agreement | 42,626 |  | 117,869
Purchase price for shares issued under purchase agreement | $ 2,000 |  |
Period of common stock purchase agreement | 2 years |  |
Stock issued for non-cash consideration | 13,842 |  |
Proceeds from issuance of common stock, net of issuance costs |  |  | $ 1,400
November 2013 Stock Purchase Agreement | Common Stock | Maximum | Aspire Capital Fund, LLC |  |  |
Equity Offering [Line Items] |  |  |
Shares committed to purchase | 253,503 |  |
Common stock purchase agreement, purchase commitment | $ 18,000 |  |
July 2011 stock issuance |  |  |
Equity Offering [Line Items] |  |  |
Number of shares of common stock issued in connection with warrants |  |  | 45,343

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