Quarterly report pursuant to Section 13 or 15(d)

Liquidity and Management Plans (Details Textual)

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Liquidity and Management Plans (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 09, 2016
Nov. 17, 2015
Apr. 24, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Liquidity And Management Plans [Line Items]                  
Engineering product development       $ 1,003,973 $ 2,075,000 $ 1,322,155 $ 2,500,000    
Net income (numerator for basic and diluted earnings per share)       (10,125,063) (5,605,661) (31,206,160) (18,677,522)    
Cash and Cash Equivalents, at Carrying Value, Total       $ 24,956,255 $ 15,510,189 24,956,255 15,510,189 $ 29,872,564 $ 31,494,592
Proceeds from Issuance of Common Stock           19,890,660 0    
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total           $ (24,439,565) $ (15,460,067)    
Consummation of Offering Under Shelf Registration [Member]                  
Liquidity And Management Plans [Line Items]                  
Stock Issued During Period, Shares, New Issues   3,000,005              
Proceeds from Issuance of Common Stock   $ 19,333,032              
Proceeds From Shelf Registration Debt Or Equity Securities     $ 75,000,000            
Proceeds From Issuance Of Common Stock Net   $ 19,048,456              
Private Placement [Member] | Consummation of Offering Under Shelf Registration [Member]                  
Liquidity And Management Plans [Line Items]                  
Stock Issued During Period, Shares, New Issues 1,618,123                
Proceeds from Issuance of Common Stock $ 19,890,644                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,618,123                
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 23.00