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Guarantees (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 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 678 442
Claims made (611) (521)
Balance as of June 30, 1,817 1,875
Extended Product Warranty Disclosure [Abstract]    
Product Extended Warranty Expense $ 2,400 $ 2,200