Accounts Receivable, Net and Revenue Concentrations

12 Months Ended

Dec. 31, 2015

Accounts Receivable, Net and Revenue Concentrations

Accounts receivable, net were as follows:



	December 31,
(In thousands)	2015			2014
Trade receivables, gross	$	119,090		$	91,605
Allowance for doubtful accounts	(822		)	(616		)
Allowance for sales returns	(507		)	(617		)
Net trade receivables	117,761			90,372
Other	4,040			7,617
Accounts receivable, net	$	121,801		$	97,989

Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts were as follows:



(In thousands)	Year Ended December 31,
(In thousands)	2015			2014			2013
Balance at beginning of period	$	616		$	478		$	322
Additions to costs and expenses	299			249			190
(Write-offs)/FX effects	(93		)	(111		)	(34		)
Balance at end of period	$	822		$	616		$	478

Sales Returns

The allowance for sales returns at December 31, 2015 and 2014 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 $0.3 million and $0.4 million on December 31, 2015 and 2014, respectively. The value of these returned goods was included in our inventory balance at December 31, 2015 and 2014.

Significant Customers

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



	Year Ended December 31,
	2015				2014						2013
	Amount (thousands)		% of Net Sales		Amount (thousands)			% of Net Sales			Amount (thousands)			% of Net Sales
Comcast Corporation	$	129,475	21.5	%	$	—	⁽¹⁾	—	%	⁽¹⁾	$	—	⁽¹⁾	—	%	⁽¹⁾
DIRECTV	74,857		12.4		58,622			10.4			82,679			15.6


⁽¹⁾	Net sales to this customer did not total more than 10% of our total net sales in the prior period.

Trade receivables associated with Comcast Corporation accounted for $29.4 million, or 24.1% of our accounts receivable, net at December 31, 2015. We had no other customers with trade receivables greater than 10% of our accounts receivable, net at December 31, 2015 or 2014.