Accounts Receivable, Net and Revenue Concentrations

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Accounts Receivable, Net and Revenue Concentrations

Accounts Receivable, Net and Revenue Concentrations

Accounts receivable, net were as follows:

(In thousands)	June 30, 2018			December 31, 2017
Trade receivables, gross	$	140,483		$	142,299
Allowance for doubtful accounts	(1,008		)	(1,064		)
Allowance for sales returns	(596		)	(562		)
Net trade receivables	138,879			140,673
Other	4,783			10,905
Accounts receivable, net	$	143,662		$	151,578

Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts were as follows:

(In thousands)	Six Months Ended June 30,
	2018			2017
Balance at beginning of period	$	1,064		$	904
Additions to costs and expenses	2			81
(Write-offs)/Foreign exchange effects	(58		)	(35		)
Balance at end of period	$	1,008		$	950

Sales Returns

The allowance for sales returns at June 30, 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 $0.3 million and $0.4 million on June 30, 2018 and December 31, 2017, respectively. The value of these returned goods was included in our inventory balance at June 30, 2018 and December 31, 2017.

Significant Customers

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

	Three Months Ended June 30,
	2018				2017
	$ (thousands)		% of Net Sales		$ (thousands)		% of Net Sales
Comcast Corporation	$	29,542	18.2	%	$	42,951	24.2	%
AT&T (1)	$	—	—	%	$	21,740	12.2	%

	Six Months Ended June 30,
	2018				2017
	$ (thousands)		% of Net Sales		$ (thousands)		% of Net Sales
Comcast Corporation	$	67,517	20.6	%	$	85,198	25.1	%
AT&T (1)	$	—	—	%	$	40,940	12.1	%

⁽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:

	June 30, 2018				December 31, 2017
	$ (thousands)		% of Accounts Receivable, Net		$ (thousands)		% of Accounts Receivable, Net
Comcast Corporation	$	19,570	13.6	%	$	25,142	16.6	%