Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies and Nature of Operations - Allowance for Sales Returns and Allowance for Doubtful Accounts (Details)

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Summary of Significant Accounting Policies and Nature of Operations - Allowance for Sales Returns and Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Allowance for sales returns    
Movement in Valuation Allowances and Reserves [Roll Forward]    
Balance at Beginning of Period $ 861 $ 937
Charged to Revenue, Cost or Expenses 19,691 21,837
Deductions (19,255) (21,913)
Balance at End of Period 1,297 861
Allowance for doubtful accounts    
Movement in Valuation Allowances and Reserves [Roll Forward]    
Balance at Beginning of Period 1 36
Charged to Revenue, Cost or Expenses 66 19
Deductions (46) (54)
Balance at End of Period $ 21 $ 1