Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

v3.5.0.2
Summary of Significant Accounting Policies (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 21, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Apr. 10, 2015
Summary Of Significant Accounting Policies [Line Items]            
Research and Development Expense, Total   $ 7,944,465 $ 4,758,590 $ 23,080,918 $ 13,008,190  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   5,546,269 4,807,729 5,546,269 4,807,729  
Employee Stock Purchase Plan [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Common Stock, Capital Shares Reserved for Future Issuance           600,000
Common Stock Purchase Price Discount Percentage 15.00%