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Significant Accounting Policies (Summary of Activity Related to Warranty Liability Included in Other Current Liabilities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Significant Accounting Policies [Abstract]    
Beginning balance $ 423 $ 468
Warranty accruals and adjustments 58 132
Warranty claims (181) (177)
Ending balance $ 300 $ 423