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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accrued Expenses    
Research and development costs $ 1,660 $ 698
Payroll and employee-related costs 1,228 100
Professional fees 167 215
Other 594 155
Total Accrued Expenses $ 3,649 $ 1,168