Note 6. Equity Incentive Plan and Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]  
Schedule Of Shares Available For Grant [Table Text Block]
   

Shares Available

For Grant

 

Balance as of December 30, 2012

    1,103,450  
         

Additional shares issuable under 2010 Plan (annual increase for 2013)

    2,577,033  
         

Stock options granted, net of forfeitures/cancellations

    (308,544 )
         

RSU awards granted, net of forfeitures/cancellations

    (756,950 )
         

PSU awards granted, net of forfeitures/cancellations

    (340,332 )
         

Balance as of June 30, 2013

    2,274,657  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   

Three Months Ended

   

Six Months Ended

 
   

June 30, 2013

   

July 1, 2012

   

June 30, 2013

   

July 1, 2012

 
                       
           

(in thousands)

         
                                 

Cost of sales

  $ 1,379     $ 1,738     $ 2,851     $ 3,034  
                                 

Research and development

    2,673       2,109       5,468       3,695  
                                 

Sales, general and administrative

    3,619       5,121       7,976       8,686  
                                 

Stock-based compensation expense before income taxes

    7,671       8,968       16,295       15,415  
                                 

Stock-based compensation expense after income taxes(1)

  $ 7,671     $ 8,968     $ 16,295     $ 15,415  

(1) There was no income tax benefit related to stock-based compensation because all of the Company's U.S. deferred tax assets, net of U.S. deferred tax liabilities, continue to be subject to a full valuation allowance.

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
   

Three Months Ended

   

Six Months Ended

 
   

June 30, 2013

   

July 1, 2012

   

June 30, 2013

   

July 1, 2012

 
                                 

Weighted average fair value of stock options granted

  $ 4.48     $ 4.96     $ 4.88     $ 4.17  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Three Months Ended

   

Six Months Ended

 
   

June 30, 2013

   

July 1, 2012

   

June 30, 2013

   

July 1, 2012

 
                                 

Expected volatility

    43.79 %     51.11 %     49.45 %     51.23 %

Risk-free interest rate

    1.15 %     0.63 %     0.85 %     0.76 %

Expected term (in years)

    4.35       4.35       4.35       4.35  

Dividend yield

    0.00 %     0.00 %     0.00 %     0.00 %
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
   

Six Months Ended

 
   

June 30, 2013

 
         

Stock price on grant date

  $ 11.50  

Expected volatility

    50.90 %

Risk-free interest rate

    0.21 %

Dividend yield

    0.00 %
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
   

Number of

Shares

   

Weighted

Average 

Exercise

Price 

   

Weighted

Average

 Remaining

 Contractual

 Life (in Years)

   

Aggregate

Intrinsic

Value

 
                           

(in thousands)

 

Outstanding stock options as of December 30, 2012

    6,641,892     $ 13.06       5.34     $ 15,228  
                                 

Granted

    530,000     $ 11.65                  
                                 

Cancelled/Forfeited

    (221,456 )   $ 12.77                  
                                 

Exercised

    (155,259 )   $ 9.63             $ 450  
                                 

Outstanding stock options as of June 30, 2013

    6,795,177     $ 13.04       4.84     $ 10,030  
                                 

Total vested and exercisable as of June 30, 2013

    4,436,879     $ 13.48       4.84     $ 6,221  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   

RSU

 
   

Number of

Shares

   

Weighted Average

Grant-date

Fair Value

 

Outstanding as of December 30, 2012

    2,518,916     $ 13.72  

Granted

    910,543     $ 12.46  

Cancelled/Forfeited

    (153,593 )   $ 12.75  

Vested

    (841,144 )   $ 11.66  

Outstanding as of June 30, 2013

    2,434,722     $ 14.02  
   

Key Executive RSU

   

PSU

 
   

Number of

Shares

   

Weighted Average

Grant-date

Fair Value

   

Number of

Shares

   

Weighted Average

Grant-date

Fair Value

 

Outstanding as of December 30, 2012

    1,792,171     $ 12.02       -     $ -  
                                 

Granted

    -     $ -       376,000     $ 7.40  
                                 

Cancelled/Forfeited

    (11,668 )   $ 10.25       (24,000 )   $ 7.40  
                                 

Vested

    (781,049 )   $ 11.54       -     $ -  
                                 

Outstanding as of June 30, 2013

    999,454     $ 12.41       352,000     $ 7.40