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