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Stock Based Compensation (Details 3) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Dec. 29, 2012
Stock options outstanding, exercisable and expected to vest    
Options outstanding, Number of Shares 1,442,484 1,570,543
Options outstanding, Weighted Average Exercise Price $ 3.76 $ 3.64
Options outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 4 months 17 days  
Options outstanding, Aggregate Intrinsic Value $ 1,513   
Options vested and expected to vest, Number of Shares 1,374,031  
Options vested and expected to vest, Weighted Average Exercise Price $ 3.75  
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years) 3 years 2 months 23 days  
Options vested and expected to vest, Aggregate Intrinsic Value 1,475  
Options exercisable, Number of Shares 1,023,008  
Options exercisable, Weighted Average Exercise Price $ 3.70  
Options exercisable, Weighted Average Remaining Contractual Life (Years) 2 years 2 months 27 days  
Options exercisable, Aggregate Intrinsic Value $ 1,271