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Stock Based Compensation (Tables)
3 Months Ended
Mar. 30, 2013
Stock Based Compensation [Abstract]  
Activity in stock option plan
                         
    Number of
Shares
    Weighted
Average
Exercise Price
Per Share
    Aggregate
Intrinsic
Value
(thousands)
 

Outstanding at December 29, 2012

    1,570,543     $ 3.64          

Granted

    32,400     $ 4.74          

Exercised

    (114,956   $ 2.38          

Canceled or forfeited

    (45,503   $ 4.06          
   

 

 

                 

Outstanding at March 30, 2013

    1,442,484     $ 3.76     $ 1,513  
   

 

 

                 
Weighted average assumptions for fair value estimate of stock-based awards (options)
                 
    Three Months Ended  
    March 30,
2013
    March 31,
2012
 

Average risk free interest rate

    0.59     0.92

Expected life (in years)

    4.5 years       4.55 years  

Dividend yield

    0.0     0.0

Average volatility

    86     93
Stock-based compensation expense
                 
    Three Months Ended  
    March 30,
2013
    March 31,
2012
 

Cost of revenues

  $ 22     $ 18  

Research and development

    20       19  

Sales and marketing

    22       29  

General and administrative

    97       81  
   

 

 

   

 

 

 
    $ 161     $ 147  
   

 

 

   

 

 

 
Stock options outstanding, exercisable and expected to vest
                                 
    Number of
Shares
    Weighted Average
Exercise Price
    Weighted Average
Remaining Contractual

Life (Years)
    Aggregate
Intrinsic Value
(thousands)
 

Options outstanding

    1,442,484     $ 3.76       3.38     $ 1,513  

Options vested and expected to vest

    1,374,031     $ 3.75       3.23     $ 1,475  

Options exercisable

    1,023,008     $ 3.70       2.24     $ 1,271  
Restricted stock units activity
         
    Number of
Shares
 

Outstanding at December 29, 2012

    55,999  

Restricted stock units granted

    220,000  

Restricted stock units released

    0  

Restricted stock units forfeited

    0  
   

 

 

 

Outstanding at March 30, 2013

    275,999