Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts Payable and Accrued Expenses [Abstract]
Accrued consulting and clinical trial costs	$ 1,955	$ 2,672
Accrued payroll and related costs	1,807	2,123
Restructuring accrual	0	0
Legal and professional fees	1,340	608
Accounts payable	566	793
Other	371	316
Total	$ 6,039	$ 6,512