Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accounts Payable and Accrued Expenses [Abstract]
Legal and professional fees	$ 3,165	$ 1,063
Accrued consulting and clinical trial costs	1,718	2,662
Accrued payroll and related costs	1,099	1,722
Accounts payable and other	534	1,123
Total	$ 6,516	$ 6,570