Note 10: 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 and shipment of ICs to customers in North America, Asia and Europe as follows (in thousands):

	Years Ended December 31,
	2014		2013		2012
Japan	$	1,961	$	1,207	$	1,571
Taiwan		1,894		1,831		1,700
North America		1,485		1,318		2,511
Rest of Asia		28		42		214
Europe		12		—		86

Total net revenue	$	5,380	$	4,398	$	6,082

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

	Years Ended December 31,
	2014			2013			2012
Customer A		34	%		41	%		28	%
Customer B		31	%		*			*
Customer C		11	%		13	%		26	%
Customer D		*			*			12	%

*	Represents percentage less than 10%.

Three customers accounted for 97% of net accounts receivable at December 31, 2014. Two customers accounted for 96% of net accounts receivable at December 31, 2013.

Net long-lived assets (property and equipment), classified by major geographic areas, was (in thousands):

	December 31,
	2014		2013
	(in thousands)
U.S.	$	766	$	610
Non-U.S.		88		96

Total	$	854	$	706