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Stock-based Compensation (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Aug. 31, 2012
$0.21 - $0.42
  
Range of exercise prices  
Exercise price, low end of range (in dollars per share) $ 0.21
Exercise price, high end of range (in dollars per share) $ 0.42
Options Outstanding, Number (in shares) 15
Options Outstanding, Weighted-Average Remaining Contractual Term 3 years 3 months 18 days
Options Outstanding, Weighted-Average Exercise Price per Share (in dollars per share) $ 0.30
Options Exercisable, Number (in shares) 15
Options Exercisable, Weighted-Average Exercise Price per Share (in dollars per share) $ 0.30
$0.84 - $4.89
  
Range of exercise prices  
Exercise price, low end of range (in dollars per share) $ 0.84
Exercise price, high end of range (in dollars per share) $ 4.89
Options Outstanding, Number (in shares) 264
Options Outstanding, Weighted-Average Remaining Contractual Term 6 years 10 months 24 days
Options Outstanding, Weighted-Average Exercise Price per Share (in dollars per share) $ 1.74
Options Exercisable, Number (in shares) 141
Options Exercisable, Weighted-Average Exercise Price per Share (in dollars per share) $ 1.27
$6.08 - $15.61
  
Range of exercise prices  
Exercise price, low end of range (in dollars per share) $ 6.08
Exercise price, high end of range (in dollars per share) $ 15.61
Options Outstanding, Number (in shares) 97
Options Outstanding, Weighted-Average Remaining Contractual Term 8 years 8 months 12 days
Options Outstanding, Weighted-Average Exercise Price per Share (in dollars per share) $ 6.82
Options Exercisable, Number (in shares) 28
Options Exercisable, Weighted-Average Exercise Price per Share (in dollars per share) $ 7.12
$19.00 - $19.00
  
Range of exercise prices  
Exercise price, low end of range (in dollars per share) $ 19.00
Exercise price, high end of range (in dollars per share) $ 19.00
Options Outstanding, Number (in shares) 200
Options Outstanding, Weighted-Average Remaining Contractual Term 8 years 3 months 18 days
Options Outstanding, Weighted-Average Exercise Price per Share (in dollars per share) $ 19.00
Options Exercisable, Number (in shares) 51
Options Exercisable, Weighted-Average Exercise Price per Share (in dollars per share) $ 19.00
$0.21 - $19.00
  
Range of exercise prices  
Exercise price, low end of range (in dollars per share) $ 0.21
Exercise price, high end of range (in dollars per share) $ 19.00
Options Outstanding, Number (in shares) 576
Options Outstanding, Weighted-Average Remaining Contractual Term 7 years 7 months 6 days
Options Outstanding, Weighted-Average Exercise Price per Share (in dollars per share) $ 8.54
Options Exercisable, Number (in shares) 235
Options Exercisable, Weighted-Average Exercise Price per Share (in dollars per share) $ 5.74