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Stockholders' Equity (Tables)
3 Months Ended
Mar. 30, 2013
Stockholders' Equity Note [Abstract]  
Weighted-average assumptions used to estimate the fair value of stock options
The following table summarizes the weighted-average assumptions used in estimating the grant-date fair value of stock options in the periods indicated:
 
 
 
Three Months Ended
 
 
March 30,
2013
 
March 31,
2012
Expected volatility
 
62
%
 
56
%
Expected life (years)
 
6.05

 
6.25

Expected dividend yield
 

 

Risk-free interest rate
 
1.12
%
 
1.13
%