Accounts Receivable, Net and Revenue Concentrations (Tables)

9 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Schedule of Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable, net were as follows:

(In thousands)	September 30, 2017			December 31, 2016
Trade receivables, gross	$	147,194		$	120,965
Allowance for doubtful accounts	(1,052		)	(904		)
Allowance for sales returns	(459		)	(539		)
Net trade receivables	145,683			119,522
Other	7,672			5,070
Accounts receivable, net	$	153,355		$	124,592

Allowance for Doubtful Accounts

Changes in the allowance for doubtful accounts were as follows:

(In thousands)	Nine Months Ended September 30,
	2017			2016
Balance at beginning of period	$	904		$	822
Additions (reductions) to costs and expenses	167			123
(Write-offs)/Foreign exchange effects	(19		)	15
Balance at end of period	$	1,052		$	960

Schedule of Significant Customers to Net Sales

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

	Three Months Ended September 30,
	2017				2016
	$ (thousands)		% of Net Sales		$ (thousands)		% of Net Sales
Comcast Corporation	$	36,811	21.0	%	$	35,554	21.0	%
AT&T	20,117		11.5		21,139		12.5

	Nine Months Ended September 30,
	2017				2016
	$ (thousands)		% of Net Sales		$ (thousands)		% of Net Sales
Comcast Corporation	$	122,009	23.7	%	$	111,529	22.7	%
AT&T	61,057		11.9		60,709		12.4

Schedule of Significant Customers to Accounts Receivable

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

	September 30, 2017				December 31, 2016
	$ (thousands)		% of Accounts Receivable, Net		$ (thousands)		% of Accounts Receivable, Net
Comcast Corporation	$	26,553	17.3	%	$	23,716	19.0	%
AT&T (1)	—		—		14,108		11.3

⁽¹⁾   Trade receivables associated with this customer did not total more than 10% of our accounts receivable, net at September 30, 2017.