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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The stock-based compensation expense included in the Company's consolidated financial statements for the first quarter of 2013 and 2012 was as follows (in thousands):
 
 
Three Months Ended
 
 
March 31,
2013
 
April 1,
2012
 
Cost of revenue
$
30

 
$
32

 
Research and development
166

 
93

 
Selling, general and administrative
256

 
259

 
Total costs and expenses
$
452

 
$
384

 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The following weighted average assumptions are included in the estimated fair value calculations for stock option grants:
 
 
Three Months Ended
 
March 31,
2013
 
April 1,
2012
Expected term (years)
4.91


5.01

Risk-free interest rate
0.82
%
 
0.89
%
Expected volatility
65.22
%
 
62.18
%
Expected dividend yield
—

 
—
Schedule of Share-based Compensation, Activity
The following table summarizes the shares available for grant under the 2009 Plan as of March 31, 2013:
 
 
Shares
Available for Grant
 
(in thousands)
Balance at December 30, 2012
2,920

Authorized
—

Options granted
(16
)
Options forfeited or expired
37

RSUs granted
(2
)
PRSUs forfeited or expired
5

Balance at March 31, 2013
2,944
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes stock options outstanding and stock option activity under the 1999 Plan and the 2009 Plan, and the related weighted average exercise price, for the first three months of 2013:
 
 
Number of Shares
 
Weighted
Average Exercise
Price
 
Weighted
Average
Remaining Term
 
Aggregate
Intrinsic Value
 
(in thousands)
 
 
 
(in years)
 
(in thousands)
Balance outstanding at December 30, 2012
6,960

 
$
2.55

 
 
 
 
Granted
16

 
2.36

 
 
 
 
Forfeited or expired
(37
)
 
2.81

 
 
 
 
Exercised
(18
)
 
1.42

 
 
 
 
Balance outstanding at March 31, 2013
6,921

 
$
2.55

 
6.13

 
$
2,188

Exercisable at March 31, 2013
5,204

 
$
2.53

 
5.33

 
$
1,990

Vested and expected to vest at March 31, 2013
6,601

 
$
2.55

 
6.00

 
$
2,145
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of activity for our RSUs and PRSUs for the three months ended March 31, 2013 and information regarding RSUs and PRSUs outstanding and expected to vest as of March 31, 2013 is as follows:

 
RSUs & PRSUs Outstanding
 
Number of Shares
 
Weighted Average
Grant Date Fair Value
 
(in thousands)
 
 
Nonvested at December 30, 2012
40

 
$
2.30

Granted
2

 
2.16

Vested
(17
)
 
2.33

Forfeited
(5
)
 
—

Nonvested at March 31, 2013
20

 
$
2.84
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumption
The fair value of rights issued pursuant to the Company's ESPP was estimated on the commencement date of each offering period using the following weighted average assumptions:
 
 
Three Months Ended
 
March 31,
2013
 
April 1,
2012
Expected term (months)
5.97

 
5.96

Risk-free interest rate
0.14
%
 
0.05
%
Volatility
50.28
%
 
65.67
%
Dividend yield
—

 
—