Quarterly report pursuant to Section 13 or 15(d)

Reserve for Product Warranties - Schedule of Warranty Reserve (Details)

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Reserve for Product Warranties - Schedule of Warranty Reserve (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reserve for Product Warranties        
Balance, beginning of period $ 4,802 $ 5,683 $ 5,195 $ 6,404
Additions and adjustments charged to expense 509 (151) 1,523 1,129
Utilizations (798) (684) (2,205) (2,685)
Balance, end of period $ 4,513 $ 4,848 $ 4,513 $ 4,848