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Business Description, Basis of Presentation and Significant Accounting Policies - Warranty Accrual (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Movement in Standard Product Warranty Accrual    
Balance at the beginning of year $ 338us-gaap_ProductWarrantyAccrual $ 385us-gaap_ProductWarrantyAccrual
Accruals/additions 511us-gaap_ProductWarrantyAccrualWarrantiesIssued 433us-gaap_ProductWarrantyAccrualWarrantiesIssued
Usage/claims (518)us-gaap_ProductWarrantyAccrualPayments (480)us-gaap_ProductWarrantyAccrualPayments
Balance at end of year $ 331us-gaap_ProductWarrantyAccrual $ 338us-gaap_ProductWarrantyAccrual