Share-Based Compensation (Tables)

12 Months Ended

Jul. 31, 2012

Share-Based Compensation [Abstract]

Schedule Of Valuation Assumptions [Table Text Block]

	For the years ended July 31,
	2012	2011
Volatility	81.05% - 89.77%	80.01% - 87.16%
Risk-free interest rate	0.18% - 1.32%	0.50% - 2.14%
Dividend yield	0.0%	0.0%
Expected life	4 years	5 years

Schedule Of Share Based Compensation Expense Related To Employees Directors And Consultants Stock Options [Table Text Block]

	For the years ended July 31,
	2012		2011
Share-based compensation for employees and directors:
Selling, general and administrative	$	825,000	$	1,032,000
Research and development		257,000		127,000
		1,082,000		1,159,000
Share-based compensation for consultants:
Selling, general and administrative		(5,000)		41,000
Research and development		0		(6,000)
		(5,000)		35,000
Total share-based compensation expense	$	1,077,000	$	1,194,000