Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

v3.7.0.1
Summary of Significant Accounting Policies (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 21, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Apr. 10, 2015
Summary Of Significant Accounting Policies [Line Items]            
Research and Development Expense, Total   $ 8,692,003 $ 7,462,360 $ 17,045,187 $ 15,136,453  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   7,532,800 4,493,120 7,532,800 4,493,120  
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%