Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

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Stock-Based Compensation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2011
Dec. 31, 2012
Mar. 31, 2012
Stock-Based Compensation        
Options outstanding (in shares)     3,550,000  
Options prior to Fiscal 2008
       
Stock-Based Compensation        
Options granted (in shares)     3,050,000  
Stock options
       
Stock-Based Compensation        
Options outstanding (in shares)     11,791,765 10,039,651
Options granted (in shares) 250,000 250,000 1,958,330  
Portion vesting one year after the issuance date (as a percent)     25.00%  
Portion vesting on first day of each month after one year from the issuance date (as a percent)     2.083%  
Vesting period of awards after issuance date     1 year  
Vesting period after one year of grant     48 months  
Contractual term     10 years  
Stock options | President and chief executive officer
       
Stock-Based Compensation        
Options granted (in shares)     2,000,000  
Stock options | Executive vice president of sales and marketing
       
Stock-Based Compensation        
Options granted (in shares)     850,000  
Stock options | Senior vice president of program management
       
Stock-Based Compensation        
Options granted (in shares)     250,000  
Stock options | Senior vice president of human resources
       
Stock-Based Compensation        
Options granted (in shares)     200,000  
Stock options | Senior vice president of customer service
       
Stock-Based Compensation        
Options granted (in shares)     250,000  
Restricted stock units
       
Stock-Based Compensation        
Restricted stock units outstanding (in shares)     1,457,211 1,143,262
Vesting period     4 years  
Restricted stock units | Senior vice president of customer service
       
Stock-Based Compensation        
Restricted stock units outstanding (in shares)     62,500