Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details Textual)

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Warrants (Details Textual) - $ / shares
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.79 $ 2.79
Convertible Preferred Stock Maximum Beneficial Ownership Percentage 9.99%  
Class of Warrant or Right, Outstanding 7,481,079 7,481,079
Placement Agent Warrant [Member]    
Class of Warrant or Right [Line Items]    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.89  
Class Of Warrant Or Number Of Securities 237,170  
Private Placement [Member]    
Class of Warrant or Right [Line Items]    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 2.41  
Class Of Warrant Or Right, Expiration Period Of Warrants Or Rights 3 years  
Class Of Warrant Or Number Of Securities 5,929,256