Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

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Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Summary Of Significant Accounting Policies [Line Items]        
Research and Development Expense, Total $ 3,779,852 $ 1,556,493 $ 8,055,416 $ 2,485,706
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,754,243 0 4,754,243 2,669,006