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 domestic and foreign OEM customers, 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 68% and 67% of our total net revenue for the three months ended January 31, 2014 and 2013, respectively, and 66% and 69% of our total net revenue for the six months ended January 31, 2014 and 2013, respectively. Set forth in the table below, are customers which individually accounted for 10% or more of our net revenue.


	For the Three Months Ended January 31,						For the Six Months Ended January 31,
	2014			2013			2014			2013
Koninklijke Philips Electronics N.V., or Philips		16	%		13	%		17	%		15	%
L-3 Communications Corporation, or L-3		13	%		12	%		11	%		11	%
Toshiba Corporation, or Toshiba		14	%		11	%		12	%		11	%
Siemens AG		10	%		*			10	%		*

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 balances greater than or equal to 10% of our total net accounts receivable balance:


	As of January 31, 2014			As of July 31, 2013
Philips		19	%		18	%
L-3		19	%		16	%