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Stockholders' Equity (Details 4) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Jan. 02, 2010
Stock options outstanding, exercisable and expected to vest        
Options outstanding, Number of Shares 1,570,543 1,766,401 1,618,066 1,583,508
Options outstanding, Weighted Average Exercise Price $ 3.63 $ 3.61 $ 3.65 $ 3.91
Options outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 4 months 2 days      
Options outstanding, Aggregate Intrinsic Value $ 5,698 $ 6,380 $ 5,906 $ 6,169
Options vested and expected to vest, Number of Shares 1,471,271      
Options vested and expected to vest, Weighted Average Exercise Price $ 3.63      
Options vested and expected to vest, Weighted Average Remaining Contractual Life (Years) 3 years 1 month 28 days      
Options vested and expected to vest, Aggregate Intrinsic Value 1,003      
Options exercisable, Number of Shares 1,137,298      
Options exercisable, Weighted Average Exercise Price $ 3.58      
Options exercisable, Weighted Average Remaining Contractual Life (Years) 2 years 3 months 0 days      
Options exercisable, Aggregate Intrinsic Value $ 980