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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accrued Expenses    
Accrued compensation $ 1,181 $ 796
Accrued contracted research costs 1,261 1,109
Accrued professional fees 181 791
Accrued other 655 97
Total $ 3,278 $ 2,793