Concentration of Credit Risk

12 Months Ended

Dec. 31, 2017

(14)	Concentration of Credit Risk

(a)

Concentration of Sales and Accounts Receivable

The following represents customers that accounted for 10% or more of total revenue during the years ended December 31, 2017, 2016 and 2015 and customers that accounted for 10% or more of total trade accounts receivable at December 31, 2017 and 2016:

	For the Year Ended December 31,
	2017			2016			2015
Percentage of net revenue
Customer A		21	%		20	%		15	%
Customer B		13			31			28
Customer C		10			8			1

	As of December 31,
	2017			2016
Percentage of gross trade accounts receivable
Customer A		19	%		13	%
Customer B		13			18
Customer C		10			13
Customer D		9			16

(b)

Revenue by Geography

Net revenue by geographic area are as follows. Revenue is attributed by geographic location based on the bill-to location of the Company’s customers.

	For the Year Ended December 31,
	2017			2016			2015
Percentage of net revenue
China		67	%		74	%		64	%
Other Asia		10			11			21
North America		18			10			9
Europe		5			5			6

Although the Company ships the majority of antennas to its customers in China (primarily ODM’s and distributors), the end-users of the Company’s products are much more geographically diverse.

(c)

Concentration of Purchases

During the year ended December 31, 2017, all of the Company’s products were manufactured in our Shullsburg, Wisconsin and Scottsdale, Arizona facilities and by two vendors in China. Manufacturing completed in our Shullsburg, Wisconsin facility was transferred to the Scottsdale, Arizona facility once the facility was closed in July 2017. During the year ended December 31, 2016 and 2015, all of the Company’s products were manufactured by two vendors in China.