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
Payables And Accruals [Abstract]    
Accrued research and development expenses $ 230 $ 609
Accrued employee bonus compensation 795 763
Employee withholdings 11 29
Other accrued expenses 367 304
Total accrued expenses $ 1,403 $ 1,705