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Product Warranty - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Product Warranty (Textual) [Abstract]    
Accrued product warranty costs $ 1,418 $ 1,812
Minimum    
Product Warranty (Textual) [Abstract]    
Limited warranty period on product 1 year  
Maximum    
Product Warranty (Textual) [Abstract]    
Limited warranty period on product 2 years