Note 9: 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,
	2015		2014		2013
North America	$	2,222	$	1,485	$	1,318
Taiwan		1,396		1,894		1,831
Japan		667		1,961		1,207
Rest of world		105		40		42

Total net revenue	$	4,390	$	5,380	$	4,398

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

	Years Ended December 31,
	2015			2014			2013
Customer A		34	%		*			*
Customer B		31	%		34	%		41	%
Customer C		12	%		31	%		*
Customer D		*			11	%		13	%


*	Represents percentage less than 10%.

Three customers accounted for 94% of net accounts receivable at December 31, 2015. Three customers accounted for 97% of net accounts receivable at December 31, 2014.

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

	December 31,
	2015		2014
	(in thousands)
U.S.	$	1,578	$	766
Non-U.S.		52		88

Total	$	1,630	$	854