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Product and Geographic Information (Details 2) (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
Revenues by geographic area                      
Revenues $ 5,469 $ 9,178 $ 7,905 $ 6,747 $ 5,329 $ 5,600 $ 9,957 $ 13,016 $ 29,299 $ 33,902 $ 35,763
Percentage of total net revenues 5.00%               5.00%    
Taiwan
                      
Revenues by geographic area                      
Revenues                 5,844 15,563 14,750
China
                      
Revenues by geographic area                      
Revenues                 2,127 3,788 10,503
Hong Kong
                      
Revenues by geographic area                      
Revenues                 1,619 3,650 1,893
Russia
                      
Revenues by geographic area                      
Revenues                 9,300 4,549 3,486
United States
                      
Revenues by geographic area                      
Revenues                 4,068 2,569 1,392
Other (individually less than 5% of total net revenues)
                      
Revenues by geographic area                      
Revenues                 $ 6,341 $ 3,783 $ 3,739