Accounts Receivable, Net and Revenue Concentrations

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Accounts Receivable, Net and Revenue Concentrations

Accounts Receivable, Net and Revenue Concentrations

Accounts receivable, net were as follows:

(In thousands)	March 31, 2018			December 31, 2017
Trade receivables, gross	$	154,181		$	142,299
Allowance for doubtful accounts	(1,077		)	(1,064		)
Allowance for sales returns	(539		)	(562		)
Net trade receivables	152,565			140,673
Other	7,490			10,905
Accounts receivable, net	$	160,055		$	151,578

Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts were as follows:

(In thousands)	Three Months Ended March 31,
	2018		2017
Balance at beginning of period	$	1,064	$	904
Additions to costs and expenses	4		23
(Write-offs)/Foreign exchange effects	9		18
Balance at end of period	$	1,077	$	945

Sales Returns

The allowance for sales returns at March 31, 2018 and December 31, 2017 included reserves for items returned prior to period-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 $0.2 million and $0.4 million on March 31, 2018 and December 31, 2017, respectively. The value of these returned goods was included in our inventory balance at March 31, 2018 and December 31, 2017.

Significant Customers

Net sales to the following customers totaled more than 10% of our net sales:

	Three Months Ended March 31,
	2018				2017
	$ (thousands)		% of Net Sales		$ (thousands)		% of Net Sales
Comcast Corporation	$	37,975	23.1	%	$	42,247	26.2	%
AT&T (1)	$	—	—	%	$	19,200	11.9	%

⁽¹⁾   Sales associated with this customer did not total more than 10% of our net sales as of March 31, 2018.

Trade receivables associated with these significant customers that totaled more than 10% of our accounts receivable, net were as follows:

	March 31, 2018				December 31, 2017
	$ (thousands)		% of Accounts Receivable, Net		$ (thousands)		% of Accounts Receivable, Net
Comcast Corporation	$	27,372	17.1	%	$	25,142	16.6	%