Balance Sheets (USD $)	Oct. 31, 2012	Apr. 30, 2012
ASSETS
Cash and cash equivalents	$ 1,511,513	$ 1,879,872
Accounts receivable	17,193	13,385
Government grant receivable	42,306	35,650
Inventory	109,357	83,370
Prepaid expenses	291,359	455,946
Other current assets	145,195	162,809
Total current assets	2,116,923	2,631,032
Property and equipment, net	247,525	293,606
Debt issuance costs, net	214,351	278,659
Intangible assets, net	904,498	872,971
Other assets	58,262	65,666
Total assets	3,541,559	4,141,934
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts payable	479,300	542,809
Accrued liabilities	428,817	1,273,837
Convertible Preferred Stock	429,978	1,247,266
Current portion of notes payable, net	7,195	62,958
Total current liabilities	1,345,290	3,126,870
Other liabilities	76,524
Long-term portion of notes payable, net	2,177,776	1,361,110
Total liabilities	3,599,590	4,487,980
Stockholders' equity (deficit)
Preferred stock, undesignated, authorized 9,992,500 shares; see Note 5.
Common stock, par value $.0001 per share; authorized 400,000,000 shares; issued and outstanding 32,899,900 and 29,417,718,  respectively	3,290	2,942
Additional paid-in capital	112,710,782	107,279,296
Deficit accumulated during the development stage	(112,772,103)	(107,628,284)
Total stockholders' equity (deficit)	(58,031)	(346,046)
Total liabilities and stockholders' equity (deficit)	$ 3,541,559	$ 4,141,934