9. 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 do not identify assets on a segment basis. Effective as of our interim period ended March 31, 2012, we now attribute revenues to individual countries and geographic areas based upon location of our customers. Previously, we attributed revenues to individual countries based upon the location of our selling subsidiary. We have recast the corresponding information for earlier periods, including interim periods, to report revenue to individual countries based upon the location of our customers. A summary of our revenues by geographic area is as follows (in thousands):

		Three Months Ended		Nine Months Ended
		March 31,		March 31,
		2012	2011	2012	2011
United States		$ 5,366	$ 9,582	$ 21,833	$ 30,646
Other North America		1,060	3,652	2,540	4,693
Total North America		6,426	13,234	24,373	35,339

Japan		7,829	2,344	14,655	9,785
Other Asia Pacific countries		799	1,462	1,776	2,165
Total Asia Pacific		8,628	3,806	16,431	11,950

Europe		1,229	1,269	4,689	4,418

South America		8	-	96	-
	Total revenue	$ 16,291	$ 18,309	$ 45,589	$ 51,707

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		Nine Months Ended
	March 31,		March 31,
	2012	2011	2012	2011
Customer A	38%	<10%	24%	12%
Customer B	<10%	<10%	<10%	11%
Customer C	<10%	15%	<10%	<10%
Customer D	<10%	11%	<10%	<10%

We assess credit risk through ongoing credit evaluations of customers' financial condition, and collateral is generally not required. One customer accounted for $6,012,000 or 39% of trade receivables at March 31, 2012. Three customers accounted for $1,024,000 or 13%, $1,011,000 or 12%, and $973,000 or 12% of trade receivables, respectively, at June 30, 2011. No other customers accounted for 10% or more of trade receivables as of March 31, 2012 or June 30, 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		Nine Months Ended
	March 31,		March 31,
	2012	2011	2012	2011
Vendor A	42%	<10%	31%	<10%
Vendor B	13%	26%	<10%	24%
Vendor C	<10%	17%	<10%	19%
Vendor D	<10%	11%	<10%	<10%