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Equity Financings and Warrants (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Aug. 21, 2017
Jan. 11, 2017
Equity Financing And Warrants [Line Items]          
Common stock, par value $ 0.001   $ 0.001    
Common stock, shares issued 13,923,825   11,775,062    
Proceeds from the issuance of common stock $ 3,532,000 $ 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 4,811,353        
Proceeds from the issuance of common stock $ 10,100,000        
Net proceeds from issuance of common stock $ 9,500,000        
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