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Guarantees (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Guarantor Obligations [Line Items]    
Standard warranty period (in years) 1 year  
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance as of January 1, $ 1,750 $ 1,954
Provision for warranties 1,036 787
Claims made (937) (907)
Balance as of September 30, 1,849 1,834
Extended Product Warranty Disclosure [Abstract]    
Product Extended Warranty Expense $ 4,000 $ 2,800