4. Accounts Receivable, Net

Our accounts receivable arise primarily from products sold and services provided in the U.S., Europe and Asia. The balance in accounts receivable represents the amount due from our OEM customers and our customers in the healthcare and airport security markets. We grant credit to domestic and foreign original equipment manufacturers, distributors, and end users. The majority of our accounts receivable have standard payment terms that require payment within 30 days. We perform ongoing credit evaluations of our customers’ financial condition and continuously monitor collections and payments from our customers and maintain a provision for estimated credit losses based upon specific customer collection issues that have been identified. We accrue reserves against trade receivables for estimated losses that may result from a customer’s inability to pay. Amounts determined to be uncollectible are charged or written off against the reserve. To date, our historical write-offs of accounts receivable have been minimal.

Our top ten customers combined accounted for approximately 62% and 71% of our total net revenue for the three months ended October 31, 2013 and 2012, respectively. We had three customers, as set forth in the table below, which individually accounted for 10% or more of our net revenue.


	For the Three Months Ended October 31
	2013			2012
Koninklijke Philips Electronics N.V. (“Philips”)		17	%		17	%
Siemens AG (“Siemens”)		10	%		*
Toshiba Corporation (“Toshiba”)		*			11	%

Note	(*): Total net revenue was less than 10% in this period.

The following table summarizes the net accounts receivable due from our customers with net accounts receivable balance greater than or equal to 10% of our total net accounts receivable balance:


	As of October 31, 2013			As of July 31, 2013
Philips		17	%		18	%
L-3 Communications Security and Detection Systems (“L-3”)		13	%		16	%