Prepaid Expenses (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Prepaid Expenses
Prepaid clinical trial expense	$ 1,751,051	$ 1,677,434
Prepaid insurance	1,130,205	761,842
Other	130,494	41,933
Total prepaid expenses	3,011,750	2,481,209
Prepaid expenses, short-term and long-term
Prepaid expenses, short-term	1,260,699	803,775
Prepaid expenses, long-term	1,751,051	1,677,434
Total prepaid expenses	$ 3,011,750	$ 2,481,209