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Accounts Receivable, Net and Revenue Concentrations
 12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Accounts Receivable, Net and Revenue Concentrations
Accounts Receivable, Net and Revenue Concentrations
Accounts receivable, net were as follows:
 
 
December 31,
(In thousands)
2016
 
2015
Trade receivables, gross
$
120,965

 
$
119,090

Allowance for doubtful accounts
(904
)
 
(822
)
Allowance for sales returns
(539
)
 
(507
)
Net trade receivables
119,522

 
117,761

Other
5,070

 
4,040

Accounts receivable, net
$
124,592

 
$
121,801


Allowance for Doubtful Accounts
Changes in the allowance for doubtful accounts were as follows:
(In thousands)
Year Ended December 31,
2016
 
2015
 
2014
Balance at beginning of period
$
822

 
$
616

 
$
478

Additions to costs and expenses
183

 
299

 
249

(Write-offs)/Foreign exchange effects
(101
)
 
(93
)
 
(111
)
Balance at end of period
$
904

 
$
822

 
$
616


Sales Returns
The allowance for sales returns at December 31, 2016 and 2015 included reserves for items returned prior to year-end that were not completely processed, and therefore had not yet been removed from the allowance for sales returns balance. If these returns had been fully processed, the allowance for sales returns balance would have been approximately $0.4 million and $0.3 million on December 31, 2016 and 2015, respectively. The value of these returned goods was included in our inventory balance at December 31, 2016 and 2015.
Significant Customers
Net sales to the following customers totaled more than 10% of our net sales: 
 
Year Ended December 31,
 
 
2016
 
2015
 
2014
 
 
$ (thousands)
 
% of Net
Sales
 
$ (thousands)
 
% of Net
Sales
 
$ (thousands)
 
% of Net
Sales
 
Comcast Corporation
$
149,476

 
22.9
%
 
$
129,475

 
21.5
%
 
$
—

(1) 
—
%
(1) 
DIRECTV
68,110

 
10.5

 
74,857

 
12.4

 
58,622

 
10.4

 

(1) 
Net sales to this customer did not total more than 10% of our total net sales in this period.
Trade receivables associated with Comcast Corporation accounted for $23.7 million, or 19.0% of our accounts receivable, net at December 31, 2016. Trade receivables associated with DIRECTV accounted for $12.9 million, or 10.3% of our accounts receivable, net at December 31, 2016. Trade receivables associated with Comcast Corporation accounted for $29.4 million, or 24.1% of our accounts receivable, net at December 31, 2015.