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Stock Based Compensation Stock Grant Volatility (Details)
9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Share-based Compensation [Abstract]    
Expected Volatility Rate, Minimum 97.00% 88.00%
Expected Volatility Rate, Maximum 98.00% 93.00%
Risk Free Interest Rate, Minimum   1.70%
Risk Free Interest Rate, Maximum   2.70%
Risk Free Interest Rate 1.00%  
Expected Term 6 years 6 years
Grant Term Limit 10 years  
Award Vesting Period 3 years  
Exercise Term Limit 10 years