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Other Financial Statement Data (Schedule Of Accrued Expenses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Balance Sheet Related Disclosures [Abstract]      
Wages and benefits $ 3,034 $ 2,768  
Warranty liability 943 793 $ 784
Income taxes payable 263 269  
Other 113 63  
Total accrued expenses $ 4,353 $ 3,893