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Stock Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 29, 2013
Dec. 29, 2012
Stock options outstanding, exercisable and expected to vest    
Options outstanding, Number of Shares 1,242,859 1,570,543
Options outstanding, Weighted Average Exercise Price $ 3.83 $ 3.64
Options outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 5 months 9 days  
Options outstanding, Aggregate Intrinsic Value $ 2,736   
Options vested and expected to vest, Number of Shares 1,183,162  
Options vested and expected to vest, Weighted Average Exercise Price $ 3.83  
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years) 3 years 3 months 22 days  
Options vested and expected to vest, Aggregate Intrinsic Value 2,619  
Options exercisable, Number of Shares 870,170  
Options exercisable, Weighted Average Exercise Price $ 3.79  
Options exercisable, Weighted Average Remaining Contractual Life (Years) 2 years 3 months 29 days  
Options exercisable, Aggregate Intrinsic Value $ 1,999