Note 5. Equity Incentive Plan and Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2013
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
    (381,869 )
         
RSU awards granted, net of forfeitures/cancellations
    (203,485 )
         
PSU awards granted, net of forfeitures/cancellations
    (376,000 )
         
Balance as of March 31, 2013
    2,719,129  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
 
   
March 31, 2013
   
March 25, 2012
 
   
(in thousands)
 
             
Cost of sales
  $ 1,472     $ 1,296  
Research and development
    2,795       1,586  
Sales, general and administrative
    4,357       3,565  
Stock-based compensation expense before income taxes
    8,624       6,447  
Stock-based compensation expense after income taxes(1)
  $ 8,624     $ 6,447  
(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
 
   
March 31, 2013
   
March 25, 2012
 
             
Weighted average fair value of stock options granted
  $ 4.99     $ 4.04  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three Months Ended
 
   
March 31, 2013
   
March 25, 2012
 
             
Expected volatility
    54.03 %     51.36 %
Risk-free interest rate
    0.60 %     0.92 %
Expected term (in years)
    4.35       4.35  
Dividend yield
    0.00 %     0.00 %
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
   
Three Months Ended
 
   
March 31, 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
    408,000     $ 11.50                  
                                 
Canceled/Forfeited
    (26,131 )   $ 14.43                  
                                 
Exercised
    (68,505 )   $ 9.34             $ 202  
                                 
Outstanding stock options as of March 31, 2013
    6,955,256     $ 13.00       5.19     $ 12,039  
                                 
Total vested and exercisable as of March 31, 2013
    3,964,421     $ 13.47       4.77     $ 6,466  
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
    237,975     $ 11.50  
                 
Canceled/Forfeited
    (34,490 )   $ 12.25  
                 
Vested
    (623,670 )   $ 10.45  
                 
Outstanding as of March 31, 2013
    2,098,731     $ 14.46  
   
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  
                                 
Canceled/Forfeited
    -     $ -       -     $ -  
                                 
Vested
    (764,382 )   $ 11.56       -     $ -  
                                 
Outstanding as of March 31, 2013
    1,027,789     $ 12.36       376,000     $ 7.40