Accrued Expenses and Other Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Accrued Expenses and Other Liabilities [Abstract]
Accrued development expenses	$ 1,080,197	$ 1,716,557
Accrued professional services	1,056,039	365,680
Accrued employee payroll and related expenses	966,207	189,746
Other	80,244	56,894
Accrued expenses and other liabilities	$ 3,182,687	$ 2,328,877