Accounts Payable and Accrued Expenses (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	$ 2,297,042	$ 2,210,229
Research and development expenses [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	1,351,940	1,316,095
Professional fees [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	761,061	715,672
General and administrative expenses [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	107,848	99,746
Compensation related expenses [Member]
Schedule of accounts payable and accrued expenses
Accounts payable and accrued expenses	$ 76,193	$ 78,716