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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