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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, 2013
Dec. 31, 2012
Movement in Standard Product Warranty Accrual    
Balance at the beginning of year $ 385 $ 467
Accruals/additions 433 443
Usage/claims (480) (525)
Balance at end of year $ 338 $ 385