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 6 Months Ended
May 21, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Aug. 09, 2016
Apr. 10, 2015
Summary Of Significant Accounting Policies [Line Items]              
Research and Development Expense, Total   $ 7,462,360 $ 3,779,852 $ 15,136,453 $ 8,055,416    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   4,493,120 4,754,243 4,493,120 4,754,243    
Subsequent Event [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Common Stock, Capital Shares Reserved for Future Issuance           1,618,123  
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  
Subsequent Event [Member] | Common Stock [Member]              
Summary Of Significant Accounting Policies [Line Items]              
Share Price           $ 12.36  
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%