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,

	2011		2010		2009
United States	$	5,476	$	5,886	$	2,741
Japan		4,700		6,661		7,288
Taiwan		3,197		2,888		1,206
Europe		727		—		24
Rest of Asia		7		128		199

Total	$	14,107	$	15,563	$	11,458

	Years Ended December 31,

	2011			2010			2009
Customer A		23	%		18	%		10	%
Customer B		17	%		23	%		44	%
Customer C		12	%		9	%		3	%
Customer D		6	%		15	%		2	%
Customer E		—			2	%		10	%

Four customers accounted for 96% of net accounts receivable at December 31, 2011. Four customers accounted for 99% of net accounts receivable at December 31, 2010.

Net property and equipment, classified by major geographic areas, was as follows at December 31, 2011 and 2010 (in thousands):

	December 31,

	2011		2010
	(in thousands)
U.S.	$	1,216	$	1,937
Non-U.S.		166		223

Total	$	1,382	$	2,160