Accounts Receivable, Net and Revenue Concentrations (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Schedule of Accounts Receivable and Allowance for Doubtful Accounts

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

Schedule of Significant Customers to Net Sales

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.