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 6 Months Ended
Nov. 30, 2015
Nov. 17, 2015
Apr. 24, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Liquidity And Management Plans [Line Items]                  
Engineering product development       $ 181,818 $ 225,000 $ 318,812 $ 425,000    
Net income (numerator for basic and diluted earnings per share)       (10,284,555) (6,146,582) (21,081,098) (13,071,861)    
Cash and Cash Equivalents, at Carrying Value, Total       $ 14,191,312 $ 20,508,268 14,191,312 20,508,268 $ 29,872,564 $ 31,494,592
Stock Issued During Period, Shares, New Issues 3,000,005                
Proceeds From Shelf Registration Debt Or Equity Securities     $ 75,000,000            
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total           $ (15,946,841) $ (10,500,199)    
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 Shelf Registration Debt Or Equity Securities     $ 75,000,000            
Proceeds From Issuance Of Common Stock Net   $ 19,048,456