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Stock Based Compensation Stock Grant Volatility (Details)
6 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Share-based Compensation [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum 97.00% 88.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum 97.00% 88.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum 1.00% 2.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum 1.10% 2.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 6 years
Share Based Compensation Arrangement by Share Based Payment Award Options Grant Term Limit 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share Based Compensation Arrangement by Share Based Payment Award Options Exercise Term Limit 10 years