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Summary of Significant Accounting Policies - Changes in Product Warranty Accrual (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]    
Warranty accrual, beginning of period $ 910 $ 1,222
Provision for warranty costs 606 521
Product Warranty Accrual, Preexisting, Increase (Decrease) (5) (40)
Settlements made (485) (488)
Warranty accrual, end of period $ 1,026 $ 1,215