Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

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Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Feb. 14, 2017
Sep. 30, 2018
Sep. 30, 2017
Apr. 29, 2018
Apr. 25, 2018
Apr. 23, 2018
Apr. 04, 2018
Jan. 19, 2018
Feb. 08, 2017
Stockholders' Equity (Textual)                  
Sale of stock price per share       $ 1.24 $ 1.24 $ 1.38 $ 1.25 $ 2.111 $ 4.25
Proceeds from issuance of private placement and public offering   $ 1,472 $ 2,125            
Beneficial ownership, percentage   10.00%              
Common Stock [Member]                  
Stockholders' Equity (Textual)                  
Shares of restricted common stock under its equity incentive plan   55,147              
Series A Preferred Stock [Member]                  
Stockholders' Equity (Textual)                  
Series A preferred stock purchase right, description Each Right entitles the registered holder, upon the occurrence of certain events specified in the Rights Agreement, to purchase from the Company one one-thousandth of a share of the Company's Series A Preferred Stock at a price of $7.00, subject to certain adjustments.