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Equity Financings and Warrants (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 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 10,116,586   9,082,366
Proceeds from the issuance of common stock $ 2,284,000    
JonesTrading      
Equity Financing And Warrants [Line Items]      
Percentage of selling commission per share sold   3.00%  
Sales Agreement      
Equity Financing And Warrants [Line Items]      
Common stock, shares issued 1,019,282    
Proceeds from the issuance of common stock $ 2,500,000    
Net proceeds from issuance of common stock $ 2,100,000    
Sales Agreement | JonesTrading      
Equity Financing And Warrants [Line Items]      
Common stock, par value   $ 0.001  
Sales Agreement | JonesTrading | Maximum      
Equity Financing And Warrants [Line Items]      
Aggregate offering price of common stock authorized   $ 7,300,000