Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts Payable and Accrued Expenses [Abstract]
Legal and professional fees	$ 3,884	$ 1,063
Accrued consulting and clinical trial costs	2,131	2,662
Accrued payroll and related costs	1,477	1,722
Accounts payable and other	2,335	1,123
Total	$ 9,827	$ 6,570