Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accrued expenses    
Compensation expense $ 1,210 $ 2,325
Professional fees 1,663 1,322
Research and development fees 778 791
Audit and tax fees 402 424
Other current liabilities 2,525 1,308
Total $ 6,578 $ 6,170