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Summary of Significant Accounting Policies and Nature of Operations (Tables)
 12 Months Ended
Dec. 30, 2017
Accounting Policies [Abstract]  
Allowance for Sales Returns and Allowance for Doubtful Accounts
The following table provides an analysis of the allowance for sales returns and the allowance for doubtful accounts (in thousands):
 
 
Balance at
Beginning
of Period
 
Charged to
Revenue,
Cost or
Expenses
 
Deductions
 
Balance at
End of
Period
Fifty-Two Weeks Ended December 30, 2017
 
 
 
 
 
 
 
Allowance for sales returns
$
937

 
$
21,837

 
$
(21,913
)
 
$
861

Allowance for doubtful accounts
36

 
19

 
(54
)
 
1

Fifty-Two Weeks Ended December 31, 2016
 
 
 
 
 
 
 
Allowance for sales returns
$
1,009

 
$
23,877

 
$
(23,949
)
 
$
937

Allowance for doubtful accounts
17

 
235

 
(216
)
 
36

Fifty-Two Weeks Ended January 2, 2016
 
 
 
 
 
 
 
Allowance for sales returns
$
897

 
$
23,655

 
$
(23,543
)
 
$
1,009

Allowance for doubtful accounts
41

 
29

 
(53
)
 
17
Aggregate Warranty Liabilities
For the fiscal year 2017 and 2016, the activity in the aggregate warranty liabilities was as follows (in thousands):
 
 
December 30, 2017
 
December 31, 2016
Warranty liabilities, beginning of period
$
889

 
$
110

Additions to warranty liabilities
963

 
918

Reductions to warranty liabilities
(442
)
 
(139
)
Warranty liabilities, end of period
$
1,410

 
$
889