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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Jan. 03, 2016
Allowance for doubtful receivables [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 42 $ 61 $ 110
Charged to Costs and Expenses 60 28 50
Deductions (23) (47) (99)
Balance at End of Period 79 42 61
Allowance for sales returns [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 1,334 1,325 1,320
Charged to Costs and Expenses (278) 9 5
Balance at End of Period 1,056 1,334 1,325
Inventory reserves [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 5,680 6,254 5,349
Charged to Costs and Expenses 4,819 4,553 6,556
Deductions (4,649) (5,127) (5,651)
Balance at End of Period $ 5,850 $ 5,680 $ 6,254