8. Concentration of Credit Risk, Segment, and Geographic Information

We operate in two segments, products and services, as disclosed within our condensed consolidated Statements of Operations and Comprehensive Income. We evaluate segment results using revenues and gross margin as the performance measures. Such information is shown on the face of the accompanying statements of operations. We do not identify assets on a segment basis. We attribute revenues to individual countries and geographic areas based upon location of our customers. A summary of our revenues by geographic area is as follows (in thousands):


		Three Months Ended
		September 30,
		2012		2011
United States	$	10,001	$	7,132
Other North America		562		734
Total North America		10,563		7,866
Japan		3,168		3,187
Other Asia Pacific countries		112		216
Total Asia Pacific		3,280		3,403
Europe		1,159		1,531
South America		2		88
Total revenue	$	15,004	$	12,888

In addition, the following summarizes revenues by significant customer where such revenue accounted for 10% or more of total revenues for any one of the indicated periods:


	Three Months Ended
	September 30,
	2012		2011
Customer A	20	%	<10	%
Customer B	<10	%	22	%
Customer C	<10	%	14	%

We assess credit risk through ongoing credit evaluations of customers' financial condition, and collateral is generally not required. The following summarizes accounts receivable by significant customer where such account receivables were 10% or more of total accounts receivables for any one of the indicated periods:


	As of September 30,
	2012		2011
Customer A	19	%	<10	%
Customer D	<10	%	19	%
Customer C	<10	%	16	%

There were no other customers representing 10% or more of our trade receivables at September 30, 2012 and 2011.

The following summarizes purchases from significant vendors where such purchases accounted for 10% or more of total purchases for any one of the indicated periods:


	Three Months Ended
	September 30,
	2012		2011
Vendor A	14	%	<10	%
Vendor B	13	%	22	%
Vendor C	11	%	<10	%
Vendor D	<10	%	11	%