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Accounts Payable and Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts Payable and Accrued Expenses [Abstract]    
Accrued consulting and clinical trial costs $ 1,988 $ 2,193
Accrued payroll and related costs 1,518 1,552
Restructuring accrual 537 813
Legal and professional fees 939 774
Accounts payable 859 229
Other 120 79
Total $ 5,961 $ 5,640