Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued expenses    
Compensation expense $ 1,841 $ 2,325
Professional fees 1,077 1,322
Research and development fees 1,811 791
Audit and tax fees 480 424
Other current liabilities 772 1,308
Total $ 5,981 $ 6,170