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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Accrued Expenses      
Accrued compensation $ 542   $ 1,252
Accrued contracted research costs 2,319   1,850
Accrued professional fees 136   215
Accrued other 297   360
Total $ 3,294 $ 3,677 $ 3,677