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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