Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Accounts Payable and Accrued Liabilities, Current [Abstract]
Professional fees	$ 1,959,000	$ 2,593,000
Research and development costs	2,625,000	2,945,000
Litigation settlement	4,500,000	0
Wages, bonuses and employee benefits	527,000	451,000
Other	82,000	5,000
Total	$ 9,693,359	$ 5,994,072