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Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Valuation assumptions          
Dividend yield (as a percent)       0.00%  
Employee Stock Purchase Plan
          
Stock-Based Compensation          
Shares issued under employee stock purchase plans       169,398 146,034
Price per share of shares issued (in dollars per share)       $ 4.21 $ 16.50
Shares available for issuance   1,644,566   1,644,566  
Increase in shares approved for issuance 1,500,000        
Shares issued at discount from the fair market value (as a percent)       15.00%  
Stock-based compensation   $ 0.6 $ 0.5 $ 1.9 $ 1.3
Unrecognized compensation cost net of expected forfeitures   0.2   0.2  
Expected weighted-average period for recognition of compensation cost       1 month  
Valuation assumptions          
Expected stock price volatility (as a percent)       63.00% 56.00%
Risk free interest rate (as a percent)       0.20% 0.10%
Expected term       6 months 6 months
Weighted-average fair value of stock options granted (in dollars per share)       $ 1.61 $ 5.96
Stock Option Plans
          
Stock-Based Compensation          
Stock-based compensation   3.6 5.0 11.9 15.2
Unrecognized compensation cost net of expected forfeitures   31.3   31.3  
Expected weighted-average period for recognition of compensation cost       3 years  
Stock options granted (in shares)   2,590,711 487,550 7,592,911 2,199,761
Estimated total grant date fair value   3.2 4.6 32.3 22.9
Total fair value of options vested   84.7   84.7  
Total intrinsic value of options exercised   0.1 1.7 0.2 5.7
Net proceeds from employee stock option       1.0  
Valuation assumptions          
Expected stock price volatility (as a percent)   65.00% 75.00%    
Expected stock price volatility rate minimum (as a percent)       60.00% 50.00%
Expected stock price volatility rate maximum (as a percent)       68.00% 75.00%
Risk free interest rate (as a percent)   0.60% 2.30%    
Risk free interest rate minimum (as a percent)       0.60% 2.30%
Risk free interest rate maximum (as a percent)       0.90% 2.80%
Expected term   5 years 6 months 6 years 1 month 6 days    
Weighted-average fair value of stock options granted (in dollars per share)   $ 3.06 $ 9.48 $ 3.61 $ 10.43
Shares including nonvested equity stock and stock units
          
Stock-Based Compensation          
Stock-based compensation   1.0 1.8 4.3 5.1
Unrecognized compensation cost net of expected forfeitures   5.7   5.7  
Expected weighted-average period for recognition of compensation cost       2 years 4 months 15 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   $ 0.2   $ 3.5  
Nonvested equity stock and stock units          
Nonvested at the beginning of the period (in shares)       763,510  
Granted (in shares)   46,856   506,753  
Vested (in shares)       (312,099)  
Forfeited (in shares)       (105,315)  
Nonvested at the end of the period (in shares)   852,849   852,849  
Weighted-Average Grant-Date Fair Value          
Nonvested at the beginning of the period (in dollars per share)       $ 18.02  
Granted (in dollars per share)       $ 6.95  
Vested (in dollars per share)       $ 18.31  
Forfeited (in dollars per share)       $ 13.52  
Nonvested at the end of the period (in dollars per share)   $ 11.88   $ 11.88  
Minimum | Stock Option Plans
          
Valuation assumptions          
Expected term       5 years 6 months 6 years
Maximum | Stock Option Plans
          
Valuation assumptions          
Expected term       5 years 8 months 12 days 6 years 1 month 6 days
Stock Option Exchange Program | Stock Option Plans
          
Stock-Based Compensation          
Expected weighted-average period for recognition of compensation cost       3 years  
Stock options granted (in shares)       2,840,986