Private Placements and Public Offering (Tables)

12 Months Ended

Jul. 31, 2012

Private Placements and Public Offering

Schedule of derivative liabilities valued using a Monte Carlo valuation model

	March 28, 2012		July 31, 2011
Closing price per share of common stock	0.22		0.93
Exercise price per share	0.50		1.20
Expected volatility	125.0	%	91.6	%
Risk-free interest rate	1.05	%	1.35	%
Dividend yield	—		—
Floor price	0.50		0.50
Remaining expected term of underlying securities (years)	4.24		4.90