Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies and Nature of Operations - Aggregate Warranty Liabilities (Detail)

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Summary of Significant Accounting Policies and Nature of Operations - Aggregate Warranty Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Product Warranties Disclosures [Abstract]    
Warranty liabilities, beginning of period $ 282 $ 384
Adjustments to preexisting warranty liabilities (79) (232)
Additions to warranty liabilities 148 198
Reductions to warranty liabilities (46) (95)
Warranty liabilities, end of period $ 305 $ 255