Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued Liabilities    
External research and preclinical development $ 6,976 $ 5,875
Employee compensation and benefits 1,512 2,494
Professional fees 363 1,225
Facilities 84 134
Total accrued expenses $ 8,935 $ 9,728