Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended		533 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011
Statements Of Operations
Product Revenue	$ 27,415	$ 36,083	$ 86,892	$ 42,981	$ 456,627
Cost of sales	10,500	8,957	45,104	10,745	303,319
Net product revenue	16,915	27,126	41,788	32,236	153,308
Government grant revenue	78,244	0	78,244	0	78,244
Total net revenue	95,159	27,126	120,032	32,236	231,552
Operating expenses
Selling, general, and administrative	1,660,810	1,511,214	3,461,799	3,394,282	44,279,060
Research and development	488,577	572,649	1,140,538	1,717,892	20,753,212
Loss on impairment of long-lived assets	0	0	0	0	334,157
Total operating expenses	2,149,387	2,083,863	4,602,337	5,112,174	65,366,429
Net operating loss	2,054,228	2,056,737	4,482,305	5,079,938	65,134,877
Interest expense	871,768	5,383	1,307,566	6,589	33,619,075
Loss on extinguishment of debt	0	0	0	0	250,097
Other income (expense)	3,927	(10,183)	9,121	(32,291)	(1,289,183)
Net loss	$ 2,929,923	$ 2,051,937	$ 5,798,992	$ 5,054,236	$ 97,714,866
Net loss per share, basic	$ (0.12)	$ (0.09)	$ (0.25)	$ (0.22)
Weighted average number of common shares outstanding, basic	23,805,323	23,387,979	23,604,502	23,301,844
Net loss per share, diluted	$ (0.29)	$ (0.09)	$ (0.42)	$ (0.22)
Weighted average number of common shares outstanding, diluted	25,980,214	23,387,979	25,081,668	23,301,844