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Equity Incentive Plans and Stock-Based Compensation (Details 3) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended
Sep. 27, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Valuation assumptions          
Dividend yield (as a percent)       0.00%  
Employee Stock Purchase Plan
          
Stock-Based Compensation          
Shares issued during the period       652,272 169,398
ESPP price per share       $ 4.28 $ 4.21
Shares available for issuance   430,243   430,243  
Number of additional shares registered under the ESPP 1,500,000        
Shares issued at discount from the fair market value (as a percent)       15.00%  
Stock-based compensation   $ 400,000 $ 600,000 $ 1,400,000 $ 1,900,000
Unrecognized compensation cost net of expected forfeitures   100,000   100,000  
Expected weighted-average period for recognition of compensation cost       1 month  
Valuation assumptions          
Expected stock price volatility (as a percent)       48.00% 63.00%
Risk free interest rate       0.10% 0.20%
Expected term       6 months 6 months
Weighted-average fair value of stock options granted (in dollars per share)       $ 1.94 $ 1.61
Stock Option Plans
          
Stock-Based Compensation          
Stock options granted (in shares)   141,575 2,590,711 1,897,887 7,592,911
Estimated total grant date fair value   600,000 3,200,000 4,700,000 32,300,000
Stock-based compensation   2,500,000 3,600,000 8,100,000 11,900,000
Unrecognized compensation cost net of expected forfeitures   20,400,000   20,400,000  
Expected weighted-average period for recognition of compensation cost       2 years 5 months 9 days  
Total fair value of options vested   71,800,000   71,800,000  
Total intrinsic value of options exercised   600,000 100,000 700,000 200,000
Proceeds from Stock Options Exercised       1,800,000  
Valuation assumptions          
Expected stock price volatility (as a percent)   45.00% 65.00%    
Expected stock price volatility, minimum       45.00% 60.00%
Expected stock price volatility, maximum       47.00% 68.00%
Risk free interest rate   1.50% 0.60%    
Risk free interest rate (as a percent) - minimum       0.80% 0.60%
Risk free interest rate (as a percent) - maximum       1.50% 0.90%
Expected term   5 years 6 months 5 years 6 months    
Weighted-average fair value of stock options granted (in dollars per share)   $ 4.00 $ 3.06 $ 2.48 $ 3.61
Restricted Stock and Stock Units
          
Stock-Based Compensation          
Stock-based compensation   500,000 1,000,000 2,400,000 4,300,000
Unrecognized compensation cost net of expected forfeitures   3,600,000   3,600,000  
Expected weighted-average period for recognition of compensation cost       2 years 6 months  
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   $ 400,000 $ 200,000 $ 2,100,000 $ 3,500,000
Nonvested equity stock and stock units          
Nonvested at the beginning of the period (in shares)       922,491  
Granted (in shares)   44,944 46,856 349,896 506,753
Vested (in shares)       (350,650)  
Forfeited (in shares)       (172,349)  
Nonvested at the end of the period (in shares)   749,388   749,388  
Weighted-Average Grant-Date Fair Value          
Nonvested at the beginning of the period (in dollars per share)       $ 10.24  
Granted (in dollars per share)       $ 6.02  
Vested (in dollars per share)       $ 11.45  
Forfeited (in dollars per share)       $ 10.67  
Nonvested at the end of the period (in dollars per share)   $ 7.60   $ 7.60  
Minimum | Stock Option Plans
          
Valuation assumptions          
Expected term       5 years 4 months 29 days 5 years 6 months
Maximum | Stock Option Plans
          
Valuation assumptions          
Expected term       5 years 6 months 5 years 8 months 12 days