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Summary of Significant Accounting Policies and Nature of Operations (Tables)
 12 Months Ended
Dec. 31, 2016
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 31, 2016
 
 
 
 
 
 
 
Allowance for sales returns
$
1,009

 
$
23,804

 
$
(23,876
)
 
$
937

Allowance for doubtful accounts
17

 
254

 
(235
)
 
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

Fifty-Three Weeks Ended January 3, 2015
 
 
 
 
 
 
 
Allowance for sales returns
$
893

 
$
24,907

 
$
(24,903
)
 
$
897

Allowance for doubtful accounts
213

 
64

 
(236
)
 
41
Aggregate Warranty Liabilities
For the fiscal year 2016 and 2015, the activity in the aggregate warranty liabilities was as follows (in thousands):
 
 
December 31, 2016
 
January 2, 2016
Warranty liabilities, beginning of period
$
110

 
$
218

Adjustments to preexisting warranty liabilities
—

 
(109
)
Additions to warranty liabilities
918

 
53

Reductions to warranty liabilities
(139
)
 
(52
)
Warranty liabilities, end of period
$
889

 
$
110