Balance Sheets (Unaudited) (USD $)	Oct. 31, 2011	Apr. 30, 2011
ASSETS
Cash and cash equivalents	$ 2,004,257	$ 951,944
Accounts receivable	7,559	138,867
Government grant receivable	375,725	0
Inventory	95,720	257,382
Prepaid expenses	106,983	275,876
Other current assets	283,280	8,142
Total current assets	2,873,524	1,632,211
Property and equipment, net	351,070	442,586
Debt issuance costs, net	342,967	0
Intangible assets, net	831,407	699,951
Other assets	149,652	147,608
Total assets	4,548,620	2,922,356
LIABILITIES AND STOCKHOLDERS’ DEFICIT
Accounts payable	781,509	889,376
Accrued liabilities	1,307,203	1,250,573
Current portion of notes payable, net	7,195	43,295
Total current liabilities	2,095,907	2,183,244
Long-term portion of notes payable, net	6,178,470	4,463,635
Total liabilities	8,274,377	6,646,879
Stockholders' deficit
Preferred stock, undesignated, authorized 10,000,000 shares; none issued or outstanding	0	0
Common stock, par value $.0001 per share; authorized 400,000,000 shares; issued and outstanding 23,857,671 and 23,393,307, respectively	2,386	2,339
Additional paid-in capital	93,986,723	88,189,012
Deficit accumulated during the development stage	(97,714,866)	(91,915,874)
Total stockholders’ deficit	(3,725,757)	(3,724,523)
Total liabilities and stockholders' deficit	$ 4,548,620	$ 2,922,356