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Cash and Cash Equivalents (Summary of Cash and Cash Equivalents) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents    
Cash $ 743 $ 816
Investments with original maturity of less than three months at the time of purchase 11,142 16,688
Total cash and cash equivalents $ 11,885 $ 17,504