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Accounts Receivable, Net and Revenue Concentrations
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Accounts Receivable, Net and Revenue Concentrations
Accounts Receivable, Net and Revenue Concentrations
Accounts receivable, net were as follows:
 
December 31,
(In thousands)
2018
 
2017
Trade receivables, gross
$
133,774

 
$
142,299

Allowance for doubtful accounts
(1,121
)
 
(1,064
)
Allowance for sales returns
(731
)
 
(562
)
Net trade receivables
131,922

 
140,673

Other
12,767

 
10,905

Accounts receivable, net
$
144,689

 
$
151,578


Allowance for Doubtful Accounts
Changes in the allowance for doubtful accounts were as follows:
(In thousands)
Year Ended December 31,
2018
 
2017
 
2016
Balance at beginning of period
$
1,064

 
$
904

 
$
822

Additions to costs and expenses
305

 
166

 
183

(Write-offs)/Foreign exchange effects
(248
)
 
(6
)
 
(101
)
Balance at end of period
$
1,121

 
$
1,064

 
$
904


Significant Customers
Net sales to the following customers totaled more than 10% of our net sales: 
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
$ (thousands)
 
% of Net
Sales
 
$ (thousands)
 
% of Net
Sales
 
$ (thousands)
 
% of Net
Sales
Comcast Corporation
$
119,809

 
17.6
%
 
$
159,829

 
23.0
%
 
$
149,476

 
22.9
%
AT&T
—

(1) 
—

(1) 
77,888

 
11.2

 
74,704

 
11.5


(1) Sales associated with this customer did not total more than 10% of our net sales for the indicated period.

Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:
 
December 31,
 
2018
 
2017
 
$ (thousands)
 
% of Accounts Receivable, Net
 
$ (thousands)
 
% of Accounts Receivable, Net
Comcast Corporation
—

(1) 
—
(1) 
$
25,142

 
16.6
%
(1) Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net at December 31, 2018.