Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued research and development expenses $ 1,444 $ 587
Accrued employee bonus compensation 325 1,197
Employee withholdings 7 21
Other accrued expenses 435 298
Total accrued expenses $ 2,211 $ 2,103