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Product Warranty - Summary of Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]        
Beginning Balance $ 4,438 $ 4,815 $ 4,124 $ 6,400
Add: Accruals for warranties issued during the period 803 1,274 3,970 3,234
Less: Settlements made during the period (1,315) (1,668) (4,168) (5,213)
Ending Balance $ 3,926 $ 4,421 $ 3,926 $ 4,421