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Accrued and Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued research and development $ 1,005 $ 1,110
Accrued legal and professional fees 182 259
Other current liabilities 207 363
Accrued and other current liabilities $ 1,394 $ 1,732