XML 68 R50.htm IDEA: XBRL DOCUMENT v2.4.0.8
Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Valuation assumptions        
Dividend yield (as a percent)     0.00%  
Employee Stock Purchase Plan
        
Stock-Based Compensation        
Shares issued during the period     652,272 163,398
ESPP price per share     $ 4.28 $ 4.21
Shares available for issuance 430,243   430,243  
Shares issued at discount from the fair market value (as a percent)     15.00%  
Stock-based compensation $ 500,000 $ 600,000 $ 1,000,000 $ 1,300,000
Unrecognized compensation cost net of expected forfeitures 700,000   700,000  
Expected weighted-average period for recognition of compensation cost     4 months  
Valuation assumptions        
Expected stock price volatility (as a percent) 48.00% 63.00% 48.00% 63.00%
Risk free interest rate 0.10% 0.20% 0.10% 0.20%
Expected term 6 months 6 months 6 months 6 months
Weighted-average fair value of stock options granted (in dollars per share) $ 1.94 $ 1.61 $ 1.94 $ 1.61
Stock Option Plans
        
Stock-Based Compensation        
Stock options granted (in shares) 136,875 3,065,198 1,756,312 5,002,200
Estimated total grant date fair value 300,000 21,600,000 4,100,000 29,100,000
Stock-based compensation 2,500,000 4,000,000 5,600,000 8,300,000
Unrecognized compensation cost net of expected forfeitures 23,300,000   23,300,000  
Expected weighted-average period for recognition of compensation cost     2 years 7 months 29 days  
Total fair value of options vested 75,900,000   75,900,000  
Total intrinsic value of options exercised 100,000 100,000 100,000 200,000
Valuation assumptions        
Expected stock price volatility (as a percent) 47.00% 68.00% 47.00%  
Expected stock price volatility, minimum       60.00%
Expected stock price volatility, maximum       68.00%
Risk free interest rate 0.80% 0.90%    
Risk free interest rate (as a percent) - minimum     0.80% 0.70%
Risk free interest rate (as a percent) - maximum     0.90% 0.90%
Expected term 5 years 4 months 29 days 5 years 8 months 12 days 5 years 4 months 29 days  
Weighted-average fair value of stock options granted (in dollars per share) $ 2.61 $ 3.41 $ 2.35 $ 3.83
Restricted Stock and Stock Units [Member]
        
Stock-Based Compensation        
Stock-based compensation 600,000 1,500,000 1,900,000 3,300,000
Unrecognized compensation cost net of expected forfeitures 4,300,000   4,300,000  
Expected weighted-average period for recognition of compensation cost     2 years 2 months 24 days  
Valuation assumptions        
General nonvested equity stock service period (in years) 4 years      
Nonvested equity stock unit to directors, service period     1 year  
Total fair value of nonvested equity stock units at grant date $ 200,000 $ 200,000 $ 1,700,000 $ 3,300,000
Nonvested equity stock and stock units        
Nonvested at the beginning of the period (in shares)     922,491  
Granted (in shares) 28,456 36,526 304,952 459,897
Vested (in shares)     (312,070)  
Forfeited (in shares)     (120,753)  
Nonvested at the end of the period (in shares) 794,620   794,620  
Weighted-Average Grant-Date Fair Value        
Nonvested at the beginning of the period (in dollars per share)     $ 10.24  
Granted (in dollars per share)     $ 5.51  
Vested (in dollars per share)     $ 11.25  
Forfeited (in dollars per share)     $ 11.80  
Nonvested at the end of the period (in dollars per share) $ 7.79   $ 7.79  
Minimum | Stock Option Plans
        
Valuation assumptions        
Expected term       5 years 7 months 6 days
Maximum | Stock Option Plans
        
Valuation assumptions        
Expected term       5 years 8 months 12 days