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Revenue Recognition (Summary of the amounts reclassified from beginning contract liabilities to revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenue Recognition [Abstract]        
Amounts reclassified from beginning contract liabilities to revenue $ 257 $ 287 $ 347 $ 106
Amounts reclassified from deferred warranty revenue 120 86 225 269
Total $ 377 $ 373 $ 572 $ 375