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Stock-based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Dec. 08, 2010
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
item
Aug. 31, 2012
Less than
Aug. 31, 2012
Restricted stock unit
Aug. 31, 2011
Restricted stock unit
Aug. 31, 2011
Stock options
Aug. 31, 2010
Stock options
Aug. 31, 2012
Employees
Aug. 31, 2011
Employees
Aug. 31, 2010
Employees
Aug. 31, 2012
Employees
Cost of revenues
Aug. 31, 2011
Employees
Cost of revenues
Aug. 31, 2010
Employees
Cost of revenues
Aug. 31, 2012
Employees
Research and development
Aug. 31, 2011
Employees
Research and development
Aug. 31, 2010
Employees
Research and development
Aug. 31, 2012
Employees
Selling, general and administrative
Aug. 31, 2011
Employees
Selling, general and administrative
Aug. 31, 2010
Employees
Selling, general and administrative
Aug. 31, 2012
Employees
Stock options and stock units
Aug. 31, 2011
Employees
Stock options and stock units
Aug. 31, 2010
Employees
Stock options and stock units
Jul. 31, 2012
Employees
Restricted stock unit
Aug. 31, 2011
Employees
Restricted stock unit
Aug. 31, 2011
Employees
Stock options
Jan. 20, 2011
Directors
Restricted stock unit
Feb. 29, 2012
Directors
Restricted stock unit
Aug. 31, 2012
Directors
Restricted stock unit
Aug. 31, 2011
Directors
Restricted stock unit
Aug. 31, 2012
Nonemployees
Stock options
Aug. 31, 2011
Nonemployees
Stock options
Aug. 31, 2010
Nonemployees
Stock options
Aug. 31, 2012
Other
Aug. 31, 2011
Other
Aug. 31, 2010
Other
Feb. 29, 2012
Executives and employees
Restricted stock unit
Stock-based Compensation                                                                            
Number of share-based compensation plans       1                                                                    
Ratio of conversion of convertible preferred stock into common stock 1                                                                          
Stock-based Compensation                                                                            
Stock-based compensation expense   $ 2,616 $ 1,785 $ 247           $ 1,921 $ 862 $ 131 $ 952 $ 523 $ 52 $ 366 $ 184 $ 33 $ 603 $ 155 $ 46 $ 1,921 $ 862 $ 131           $ 578 $ 823 $ 6 $ (27) $ 54 $ 111 $ 127 $ 62  
Shares of common stock reserved for issuance   3,849,000                                                                        
Options granted of common stock (in shares)               453,000 138,000                                   453,000                      
Stock units granted (in shares)           860,000 346,000                                   43,000 275,000   71,000 31,000                 786,000
Vesting period                                             4 years   4 years                 4 years       4 years
Vesting percentage on each anniversary of the vesting start date of awards granted                                             25.00%   25.00%                         25.00%
Contractual term                                             10 years                              
Vesting percentage on first anniversary of the vesting start date of awards granted                                                       100.00% 100.00%                  
Grant-date fair value (in dollars per share)           $ 3.46 $ 17.17                                   $ 2.31     $ 19.00 $ 3.27                 $ 3.53
Number of shares of common stock for which contingent right is established by restricted stock unit (in shares)                                                       1                    
Vesting period specified for forfeiture rate         1 year