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Stock-Based Compensation (Details 3) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended
Jun. 30, 2013
Options
Jun. 30, 2012
Options
Jun. 30, 2013
Options
Jun. 30, 2012
Options
Feb. 28, 2013
ESPP
Jun. 30, 2010
ESPP
Item
Jun. 30, 2013
ESPP
Stock-Based Compensation              
Outstanding options fully vested and expected to vest (in shares) 9,900,000   9,900,000        
Remaining contractual life of options fully vested and expected to vest     3 years 6 months 4 days        
Weighted average exercise price of options fully vested and expected to vest (in dollars per share) $ 4.14   $ 4.14        
Aggregate intrinsic value of options fully vested and expected to vest (in dollars) $ 4,900,000   $ 4,900,000        
Fair value of shares vested (in dollars)     1,600,000 1,100,000      
Total intrinsic value of awards exercised (in dollars)     600,000 1,100,000      
Awards exercisable (in shares)   6,600,000   6,600,000      
Weighted average exercise price of awards exercisable (in dollars per share)   $ 4.28   $ 4.28      
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) 0.50%   0.50% 0.60%      
Risk-free interest rate, maximum (as a percent) 0.80%   0.80% 0.80%      
Volatility, minimum (as a percent) 58.00% 66.30% 58.00% 66.30%      
Volatility, maximum (as a percent) 58.30% 66.80% 59.10% 66.80%      
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              
Number of shares 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 a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less           85.00%  
Shares of common stock issued under the plan         147,000    
Aggregate purchase price (in dollars)         $ 426,000    
Shares authorized and unissued             1,189,000