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Equity Financings and Warrants (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2017
Aug. 21, 2017
Jan. 11, 2017
Dec. 31, 2016
Equity Financing And Warrants [Line Items]        
Common stock, par value $ 0.001     $ 0.001
Common stock, shares issued 11,750,744     9,082,366
Proceeds from the issuance of common stock $ 6,515,000      
JonesTrading        
Equity Financing And Warrants [Line Items]        
Percentage of selling commission per additional shares sold     3.00%  
Sales Agreement        
Equity Financing And Warrants [Line Items]        
Common stock, shares issued 2,653,440      
Proceeds from the issuance of common stock $ 6,500,000      
Net proceeds from issuance of common stock $ 6,100,000      
Sales Agreement | JonesTrading        
Equity Financing And Warrants [Line Items]        
Common stock, par value     $ 0.001  
Aggregate offering price of common stock authorized   $ 10,200,000 $ 7,300,000  
Increase in the maximum aggregate offering price of common stock authorized   $ 2,900,000