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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 31, 2012	May 31, 2012	Feb. 29, 2012	Nov. 30, 2011	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	Nov. 30, 2010	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	$ 56,059				$ 83,619				$ 56,059	$ 83,619
Net revenues	5,469	9,178	7,905	6,747	5,329	5,600	9,957	13,016	29,299	33,902	35,763
Accounts receivable | Customer concentration risk | Customer A
Concentration of Credit Risk
Concentration risk (as a percent)									15.00%
Accounts receivable | Customer concentration risk | Customer B
Concentration of Credit Risk
Concentration risk (as a percent)									11.00%	10.00%
Accounts receivable | Customer concentration risk | Customer C
Concentration of Credit Risk
Concentration risk (as a percent)										15.00%
Revenues | Customer concentration risk | Customer A
Concentration of Credit Risk
Concentration risk (as a percent)									24.00%
Net revenues									7,176
Revenues | Customer concentration risk | Customer B
Concentration of Credit Risk
Concentration risk (as a percent)									3.00%	6.00%	20.00%
Net revenues									764	1,993	6,955
Revenues | Customer concentration risk | Customer C
Concentration of Credit Risk
Concentration risk (as a percent)									0.00%	12.00%	6.00%
Net revenues									8	3,936	2,012
Revenues | Customer concentration risk | Top ten customers
Concentration of Credit Risk
Concentration risk (as a percent)									49.00%	54.00%	61.00%
United States
Concentration of Credit Risk
Net revenues									4,068	2,569	1,392
United States | U.S. Dollars
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	18,744				75,348				18,744	75,348
Taiwan
Concentration of Credit Risk
Net revenues									5,844	15,563	14,750
Taiwan | U.S. Dollars
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	34,477				3,382				34,477	3,382
Taiwan | New Taiwan Dollars
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	2,193				4,669				2,193	4,669
Taiwan | Other currencies
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	235				119				235	119
China (including Hong Kong) | U.S. Dollars
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	376				100				376	100
China (including Hong Kong) | Renminbi
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	33								33
China (including Hong Kong) | H.K. dollars
Concentration of Credit Risk
Cash, cash equivalents and short-term investments	$ 1				$ 1				$ 1	$ 1
China, Taiwan, Russia and the United States | Revenues | Customer concentration risk
Concentration of Credit Risk
Concentration risk (as a percent)									78.00%	89.00%	90.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592



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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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