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Accrued and Other Liabilities (Schedule of accrued and other current liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued research and development $ 617 $ 1,110
Accrued legal and professional fees 235 259
Other current liabilities 678 363
Accrued and other current liabilities $ 1,530 $ 1,732