Stock-Based Compensation - Summary of common stock, and non-vested common stock, options granted, forfeited or expired and exercised (Details) (USD $)	3 Months Ended
	Apr. 30, 2014	Aug. 01, 2013
Options Exercisable	37,964,390
Options
Options Outstanding		$ 29,701,197
Options Granted	8,879,499
Options Forfeited or expired	90,000
Options Exercised	526,306
Options Outstanding	37,964,390
Weighted Average Exercise Price per Share
Options Forfeited or expired	0.827
Options Exercised	0.001
Weighted Average Exercise Price per Share		$ 0.080
Weighted Average Exercise Price per Share, Granted	$ 0.001
Weighted Average Exercise Price per Share, Forfeited or expired	$ 0.529
Weighted Average Exercise Price per Share, Exercised	$ 0.001
Weighted Average Exercise Price per Share, Outstanding	$ 0.061
Weighted Average Exercise Price per Share, Exercisable		$ 0.061
Aggregate Intrinsic Value
Options Exercised	21,052
Options Outstanding	1,115,179
Options Exercisable	1,115,179
Non-vested Options
Options Outstanding		$ 60,000
Options Granted	8,879,499
Options Vested	(8,939,499)
Options Forfeited or expired	0
Options Outstanding	0
Non-vested Weighted Average Grant Date Fair Value
Options Granted	0.029
Options Vested	0.031
Weighted Average Exercise Price per Share		$ 0.460