Accrued Expenses and Other Current Liabilities (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]
Professional fees	$ 340,000	$ 286,000
Research and development costs	2,340,000	4,177,000
Wages, bonuses and employee benefits	282,000	227,000
Other	71,000	97,000
Total	$ 3,033,189	$ 4,786,956