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Other Financial Statement Data (Schedule Of Changes In Deferred Warranty Revenue) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Movement in Extended Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 344 $ 275
Revenue deferrals 417 382
Amortization of deferred revenue (348) (269)
Total deferred warranty revenue 413 388
Current portion of deferred warranty revenue (298) (274)
Long-term deferred warranty revenue $ 115 $ 114