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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accrued Expenses    
Accrued compensation $ 740 $ 1,181
Accrued contracted research costs 1,364 1,261
Accrued professional fees 17 181
Accrued other 535 655
Total $ 2,656 $ 3,278