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Summary of Significant Accounting Policies - Changes in Product Warranty Accrual (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]      
Warranty accrual, beginning of period $ 1,222 $ 1,416 $ 1,161
Provision for warranty costs 871 800 1,144
Changes in pre-existing warranties (including changes in estimates) (110) (61) (138)
Settlements made (1,293) (1,055) (1,027)
Warranty accrual, end of period $ 910 $ 1,222 $ 1,416