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Product Warranty - Schedule of Product Warranty Activity (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Summary of product warranty activity    
Beginning balance $ 2,194 $ 1,916
Charges to expense 1,039 1,478
Costs incurred (1,100) (1,106)
Ending balance $ 2,133 $ 2,288