Prepaid Expenses (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Prepaid Expenses
Prepaid clinical trial expense	$ 1,677,434	$ 1,677,434
Prepaid insurance	427,494	761,842
Other	67,727	41,933
Total prepaid expenses	2,172,655	2,481,209
Prepaid expenses, short-term and long-term
Prepaid expenses, short-term	495,221	803,775
Prepaid expenses, long-term	1,677,434	1,677,434
Total prepaid expenses	$ 2,172,655	$ 2,481,209