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Guarantees (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Guarantees [Abstract]    
Standard warranty period (in years) 1 year  
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance as of January 1, $ 1,798 $ 1,750
Provision for warranties 1,495 1,036
Claims made (1,034) (937)
Balance as of September 30, 2,259 1,849
Extended Product Warranty Disclosure [Abstract]    
Product extended warranty expense $ 4,000 $ 4,000