9. SEGMENT REPORTING (Details) (USD $)	3 Months Ended		6 Months Ended		545 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012
Product Revenue	$ 14,571	$ 27,415	$ 26,028	$ 86,892	$ 496,282
Unallocated Expense: General and Administrative	369,550	1,526,775	1,593,734	3,098,431
Unallocated Expense: Research and Development	604,574	488,577	1,241,846	1,140,538	23,317,158
Unallocated Revenue: Government Grant Revenue	(509,435)	(78,244)	(775,984)	(78,244)	(1,090,499)
Unallocated Expense: Restructuring Expense	170,298		217,774		217,774
Unallocated Expense: Net interest and other expense (income)	874,435	875,695	2,785,535	1,316,687
Net Loss	(1,557,278)	(2,929,923)	(5,143,819)	(5,798,992)	(112,772,103)
United States
Product Revenue	14,571	27,415	26,028	60,892
Segment Loss (Income)	47,856	117,120	80,914	332,165
Latin America
Product Revenue				26,000
Segment Loss (Income)				$ (10,585)