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9. EQUITY COMPENSATION PLANS (Details 1) (USD $)	3 Months Ended		9 Months Ended
9. EQUITY COMPENSATION PLANS (Details 1) (USD $)	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Cost of Contract Manufacturing
Share-based compensation expense	$ 37,000	$ 5,000	$ 55,000	$ 10,000
Research and Development
Share-based compensation expense	539,000	299,000	1,151,000	920,000
Selling, General, and Administrative
Share-based compensation expense	453,000	455,000	1,114,000	1,508,000
Total share-based compensation expense
Share-based compensation expense	1,029,000	759,000	2,320,000	2,438,000
Stock Options
Share-based compensation expense	870,000	720,000	2,069,000	2,356,000
Employee Stock Purchase Plan
Share-based compensation expense	$ 159,000	$ 39,000	$ 251,000	$ 82,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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