Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies and Nature of Operations (Details)

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Summary of Significant Accounting Policies and Nature of Operations (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Aggregate warranty liabilities    
Warranty liabilities, beginning of period $ 384 $ 154
Adjustments to preexisting warranty liabilities (232)  
Additions to warranty liabilities 157 170
Reductions to warranty liabilities (73) (54)
Warranty liabilities, end of period $ 236 $ 270