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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accrued Expenses    
Accrued compensation $ 512 $ 632
Accrued contracted research costs 1,212 1,357
Accrued professional fees 241 298
Accrued other 199 145
Total $ 2,164 $ 2,432