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Accrued and Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Accrued research and development $ 1,780 $ 1,645
Accrued legal and professional fees 274 248
Other current liabilities 265 662
Accrued and other current liabilities $ 2,319 $ 2,555