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Guarantees (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Product Warranty [Abstract]    
Period of warranty 12 months  
Change in warranty accrual [Roll Forward]    
Beginning accrued warranty and related costs $ 1,048,000us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 588,000us-gaap_ProductWarrantyAccrualClassifiedCurrent
Accruals for warranties issued during the year 865,000us-gaap_ProductWarrantyAccrualWarrantiesIssued 789,000us-gaap_ProductWarrantyAccrualWarrantiesIssued
Adjustments related to pre-existing warranties including expirations and changes in estimates (467,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease 412,000us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Cost of warranty repair (644,000)us-gaap_ProductWarrantyAccrualPayments (741,000)us-gaap_ProductWarrantyAccrualPayments
Ending accrued warranty and related costs $ 802,000us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 1,048,000us-gaap_ProductWarrantyAccrualClassifiedCurrent