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Balance Sheet Components (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Nov. 30, 2012
Aug. 31, 2012
Intangible Assets    
Gross Carrying Amount $ 2,162 $ 2,089
Accumulated Amortization 642 537
Total 1,520 1,552
Patents and trademarks
   
Intangible Assets    
Weighted Average Amortization Period 17 years 17 years
Gross Carrying Amount 613 585
Accumulated Amortization 160 146
Total 453 439
Acquired technology
   
Intangible Assets    
Weighted Average Amortization Period 4 years 4 years
Gross Carrying Amount 172 167
Accumulated Amortization 115 101
Total 57 66
Customer relationships
   
Intangible Assets    
Weighted Average Amortization Period 5 years 5 years
Gross Carrying Amount 1,377 1,337
Accumulated Amortization 367 290
Total $ 1,010 $ 1,047