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. 27, 2014
Sep. 28, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Warranty liabilities, beginning of period $ 297 $ 282
Adjustments to preexisting warranty liabilities (84) (79)
Additions to warranty liabilities 102 148
Reductions to warranty liabilities (54) (46)
Warranty liabilities, end of period $ 261 $ 305