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Accrued and Other Liabilities (Schedule of accrued and other current liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accrued research and development $ 1,282 $ 781
Accrued legal and professional fees 221 325
Other current liabilities 398 866
Accrued and other current liabilities $ 1,901 $ 1,972