Fair Value Measurements and Disclosures (Details 3) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended
	May 03, 2014	Nov. 01, 2014	Aug. 02, 2014
Warrant Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,610	$ 1,937	$ 3,346
Less: Gain from change in fair value	264	1,566	1,409
Ending balance	3,346	371	1,937
Derivative Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,081	819	1,906
Less: Gain from change in fair value	175	129	1,087
Ending balance	$ 1,906	$ 690	$ 819