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Summary of Significant Accounting Policies - Changes in Product Warranty Accrual (Detail) - USD ($)
$ in Thousands
9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Warranty accrual, beginning of period $ 1,222 $ 1,416
Provision for warranty costs 722 679
Product Warranty Accrual, Preexisting, Increase (Decrease) 99 (52)
Settlements made (751) (828)
Warranty accrual, end of period $ 1,292 $ 1,215