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Guarantees (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 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 323 150
Claims made (290) (279)
Balance as of March 31, 1,783 1,825
Extended Product Warranty Disclosure [Abstract]    
Product Extended Warranty Expense $ 1,300 $ 1,100