Annual report pursuant to Section 13 and 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued expenses    
Compensation expense $ 2,325 $ 1,198
Professional fees 1,322 624
Research and development fees 791 1,284
Audit and tax fees 424 455
Other current liabilities 1,308 158
Total $ 6,170 $ 3,719