Fair Value Measurements (Details) (Derivative Financial Instruments, Liabilities [Member], Series B Preferred Stock [Member], Fair Value, Inputs, Level 3 [Member], Fair Value, Measurements, Recurring [Member], USD $)	3 Months Ended	6 Months Ended
	Apr. 28, 2012	Jul. 28, 2012
Derivative Financial Instruments, Liabilities [Member] | Series B Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Summary of fair value assumptions for derivative liabilities
Conversion price	$ 1.75	$ 1.75
Expected volatility	65.00%	66.00%
Expected term (in years)	9 years 7 months 6 days	9 years 3 months 18 days
Risk free interest rate	1.96%	1.58%
Expected dividends