XML 16 R29.htm IDEA: XBRL DOCUMENT v2.4.0.6
Stock-Based Compensation (Details 3) (USD $)
 3 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Options
Jun. 30, 2011
Options
Jun. 30, 2012
Options
Jun. 30, 2011
Options
Jun. 30, 2010
ESPP
item
Jun. 30, 2012
ESPP
Stock-Based Compensation            
Outstanding options fully vested and expected to vest (in shares) 10,000,000   10,000,000      
Remaining contractual life of options fully vested and expected to vest     3 years 5 months 23 days      
Weighted average exercise price of options fully vested and expected to vest (in dollars per share) $ 4.06   $ 4.06      
Aggregate intrinsic value of options fully vested and expected to vest (in dollars) $ 4,100,000   $ 4,100,000      
Fair value of shares vested (in dollars)     1,100,000 1,100,000    
Total intrinsic value of awards exercised (in dollars)     1,100,000 1,900,000    
Awards exercisable (in shares) 6,600,000 5,600,000 6,600,000 5,600,000    
Weighted average exercise price of awards exercisable (in dollars per share) $ 4.28 $ 4.47 $ 4.28 $ 4.47    
Assumptions used in estimation of fair value of the share-based payment awards on the grant date            
Risk-free interest rate (as a percent) 0.60%          
Risk-free interest rate, minimum (as a percent)   1.10% 0.60% 1.10%    
Risk-free interest rate, maximum (as a percent)   1.70% 0.80% 1.70%    
Volatility, minimum (as a percent) 66.30% 62.70% 66.30% 62.70%    
Volatility, maximum (as a percent) 66.80% 63.80% 66.80% 63.80%    
Expected life 4 years 4 years 4 years 4 years    
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%    
Period for which historical volatility is considered to determine expected volatility     4 years      
Employee Stock Purchase Plan            
Shares of common stock reserved for issuance         2,000,000  
Maximum amount of shares that eligible employee may purchase annually (in dollars)         $ 25,000  
Number of offering periods         2  
Offering period           6 months
Purchase price to be paid by participants as percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less         85.00%  
Shares authorized and unissued           1,500,000