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Fair Value of Financial Assets and Liabilities (Schedule of Financial Assets and Liabilities Measured) (Details) - Recurring Basis [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets:    
Cash equivalents $ 11,142 $ 16,688
Total Assets 11,142 16,688
Level 1 [Member]    
Assets:    
Cash equivalents 11,142 16,688
Total Assets $ 11,142 $ 16,688