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Product Warranty - Schedule of Product Warranty Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Summary of product warranty activity    
Beginning balance $ 1,812 $ 2,194
Charges to expense 61 470
Costs incurred (239) (452)
Ending balance $ 1,634 $ 2,212