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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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