XML 23 R55.htm IDEA: XBRL DOCUMENT v2.4.0.6
Common and Convertible Preferred Stock and Equity (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 0 Months Ended 0 Months Ended 1 Months Ended
Dec. 08, 2010
Aug. 31, 2012
Aug. 31, 2011
Nov. 13, 2010
Dec. 08, 2010
Common Stock
Dec. 31, 2010
Common Stock
Aug. 31, 2012
Common Stock
Aug. 31, 2011
Common Stock
Dec. 08, 2011
Class A
Dec. 08, 2010
Convertible preferred stock
Common and Convertible Preferred Stock and Equity                    
Reverse stock split ratio of the common and convertible preferred stock       14            
Common and convertible preferred stock and equity                    
Conversion Ratio                 1  
Issuance of stock (in shares)         5,250          
Offering price (in dollars per share)         $ 17.00          
Purchase of shares by underwriters (in shares)           788        
Net proceeds from the initial public offering           $ 95.5        
Common stock, offering-related expenses           $ 3.5        
Class B common stock shares converted to common stock           661        
Common stock, shares authorized   32,143 32,143       32,143      
Common stock, par value (in dollars per share)   $ 0.0000056 $ 0.0000056       $ 0.0000056      
Common stock reserved for issuance (in shares)             2,945 3,153    
Convertible preferred stock, shares issued                   13,719
Ratio of conversion of convertible preferred stock into common stock 1                  
Common stock issued as a result of conversion of convertible preferred stock (in shares) 13,719