Accounts Payable and Accrued Expenses (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	$ 2,278,398	$ 2,210,229
Research and development expenses [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	1,339,851	1,316,095
Professional fees [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	735,990	715,672
General and administrative expenses [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	121,554	99,746
Compensation related expenses [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	$ 81,003	$ 78,716