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Product Warranty (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Product Warranty      
Product warranty period 1 year    
Changes in standard product warranty liability      
Balance at January 1 (beginning of year) $ 4,612 $ 3,244 $ 5,091
Warranties issued during the period 7,808 5,005 3,615
Settlements made during the period (4,282) (4,270) (5,548)
Changes in estimate of liability for pre-existing warranties during the period (1,214) 633 86
Balance at September 30 (end of period) 6,924 4,612 3,244
Product warranty classification      
Amount classified as current 6,424 4,280 2,759
Amount classified as long-term 500 332 485
Total warranty liability $ 6,924 $ 4,612 $ 3,244