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Fair Value of Financial Assets and Liabilities (Schedule of Financial Assets and Liabilities Measured) (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets:    
Cash equivalents $ 4,477 $ 5,326
Total Assets 4,477 5,326
Level 1    
Assets:    
Cash equivalents 4,477 5,326
Total Assets 4,477 5,326
Level 2    
Assets:    
Cash equivalents 0 0
Total Assets 0 0
Level 3    
Assets:    
Cash equivalents 0 0
Total Assets $ 0 $ 0