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Accrued and Other Liabilities (Schedule of accrued and other current liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued research and development $ 753 $ 1,110
Accrued legal and professional fees 233 259
Other current liabilities 198 363
Accrued and other current liabilities $ 1,184 $ 1,732