Quarterly report pursuant to Section 13 or 15(d)

Liquidity and Management Plans (Details Textual)

v3.7.0.1
Liquidity and Management Plans (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Liquidity And Management Plans [Line Items]            
Engineering product development $ 299,506 $ 181,818 $ 874,874 $ 318,812    
Net income (loss) (12,919,010) (10,284,555) (25,392,150) (21,081,098)    
Cash and Cash Equivalents, at Carrying Value, Total $ 13,084,360 $ 14,191,312 13,084,360 14,191,312 $ 31,258,637 $ 29,872,564
Proceeds from Issuance of Common Stock         $ 34,788,311  
Net Cash Provided by (Used in) Operating Activities, Continuing Operations, Total     $ (18,956,003) $ (15,946,841)