Note 11: Business Segments, Concentration of Credit Risk and Significant Customers

The Company operates in one business segment and uses one measurement of profitability for its business. Revenue attributed to the United States and to all foreign countries is based on the geographical location of the customer.

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of cash, cash equivalents, short-term and long-term investments and accounts receivable. Cash, cash equivalents and short-term and long term investments are deposited with high credit quality institutions.

The Company recognized revenue from licensing of its technologies to customers in North America, Asia and Europe as follows (in thousands):

	Years Ended December 31,

	2012		2011		2010
United States	$	2,511	$	5,476	$	5,886
Taiwan		1,700		3,197		2,888
Japan		1,571		4,700		6,661
Europe		86		727		—
Rest of Asia		214		7		128

Total	$	6,082	$	14,107	$	15,563

Customers who accounted for at least 10% of total revenues were as follows:

	Years Ended December 31,

	2012			2011			2010
Customer A		28	%		23	%		18	%
Customer B		26	%		12	%		*
Customer C		12	%		17	%		23	%
Customer D		*			*			15	%

*: Represents percentages less than 10%.

Three customers accounted for 100% of net accounts receivable at December 31, 2012. Four customers accounted for 96% of net accounts receivable at December 31, 2011.

Net property and equipment, classified by major geographic areas, was as follows at December 31, 2012 and 2011 (in thousands):

	December 31,

	2012		2011
	(in thousands)
U.S.	$	1,114	$	1,216
Non-U.S.		124		166

Total	$	1,238	$	1,382