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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities    
External research and preclinical development $ 7,910 $ 5,875
Employee compensation and benefits 2,461 2,494
Professional fees 695 1,225
Facilities 93 134
Total accrued expenses $ 11,159 $ 9,728