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Product Warranty (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Summary of product warranty activity    
Beginning balance $ 2,194 $ 1,916
Charges to expense 701 1,169
Costs incurred (758) (904)
Ending balance $ 2,137 $ 2,181