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Stock-Based Compensation (Details 4) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended
Jun. 30, 2014
Options
Jun. 30, 2013
Options
Jun. 30, 2014
Options
Jun. 30, 2013
Options
Jun. 30, 2014
Options
Minimum
Jun. 30, 2014
Options
Minimum
Jun. 30, 2014
Options
Maximum
Jun. 30, 2014
Options
Maximum
Feb. 28, 2013
ESPP
Jun. 30, 2010
ESPP
Item
Jun. 30, 2014
ESPP
Stock-Based Compensation                      
Outstanding options fully vested and expected to vest (in shares) 9,400,000   9,400,000                
Remaining contractual life of options fully vested and expected to vest     3 years 5 months 19 days                
Weighted average exercise price of options fully vested and expected to vest (in dollars per share) $ 4.10   $ 4.10                
Aggregate intrinsic value of options fully vested and expected to vest (in dollars) $ 1,400,000   $ 1,400,000                
Fair value of shares vested (in dollars)     1,500,000 1,600,000              
Total intrinsic value of awards exercised (in dollars)     700,000 600,000              
Assumptions used in estimation of fair value of the share-based payment awards on the grant date                      
Risk-free interest rate, minimum (as a percent) 1.60% 0.50% 1.50% 0.50%              
Risk-free interest rate, maximum (as a percent) 1.70% 0.80% 1.70% 0.80%              
Volatility, minimum (as a percent) 55.90% 58.00% 55.90% 58.00%              
Volatility, maximum (as a percent) 56.70% 58.30% 57.50% 59.10%              
Expected life   4 years   4 years 4 years 4 years 5 years 5 years      
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00%              
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                 140,000    
Aggregate purchase price (in dollars)                 $ 434,000    
Shares authorized and unissued                     920,000