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. 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				Six Months Ended
		December 31,				December 31,
		2012		2011		2012		2011
United States	$	10,191	$	9,316	$	20,192	$	16,445
Other North America		1,482		746		2,044		1,480
Total North America		11,673		10,062		22,236		17,925
Japan		3,465		3,637		6,633		6,826
Other Asia Pacific countries		555		704		667		920
Total Asia Pacific		4,020		4,341		7,300		7,746
Europe		894		2,007		2,053		3,539
South America		2		-		4		88

Total revenue	$	16,589	$	16,410	$	31,593	$	29,298

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				Six Months Ended
	December 31,				December 31,
	2012		2011		2012		2011
Customer A	16	%	12	%	13	%	<10	%
Customer B	12	%	12	%	16	%	10	%
Customer C	<10	%	17	%	<10	%	17	%
Customer D	<10	%	<10	%	<10	%	12	%

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 for whom accounts receivable were 10% or more of total accounts receivables for any one of the indicated periods:


	December 31,		June 30,
	2012		2012
Customer E	12	%	19	%
Customer A	12	%	12	%

There were no other customers representing 10% or more of our trade receivables at December 31, 2012 and June 30, 2012.

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				Six Months Ended
	December 31,				December 31,
	2012		2011		2012		2011
Vendor A	18	%	31	%	16	%	26	%
Vendor B	12	%	<10	%	11	%	<10	%
Vendor C	11	%	<10	%	12	%	<10	%