Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

v3.4.0.3
Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended
Apr. 10, 2015
Mar. 31, 2016
Mar. 31, 2015
Summary Of Significant Accounting Policies [Line Items]      
Research and Development Expense, Total   $ 7,674,093 $ 4,275,565
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   4,928,753 3,511,890
Employee Stock Purchase Plan [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Common Stock, Capital Shares Reserved for Future Issuance 600,000 553,977  
Common Stock Purchase Price Discount Percentage 15.00%