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Business Description, Basis of Presentation and Significant Accounting Policies - Warranty Accrual (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Movement in Standard Product Warranty Accrual    
Balance at the beginning of year $ 331 $ 338
Accruals/additions 442 511
Usage/claims (485) (518)
Balance at end of year $ 288 $ 331