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Guarantees (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Product Warranty [Abstract]    
Period of warranty 12 months  
Change in warranty accrual [Roll Forward]    
Beginning accrued warranty and related costs $ 802 $ 1,048
Accruals for warranties issued 662 865
Adjustments related to pre-existing warranties including expirations and changes in estimates (238) (467)
Cost of warranty repair (729) (644)
Ending accrued warranty and related costs $ 497 $ 802