Statements of Operations (Unaudited) (USD $)	3 Months Ended		554 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013
Statements Of Operations
Product Revenue	$ 35,394	$ 11,458	$ 598,331
Cost of sales	27,510	5,911	380,089
Net product revenue	7,884	5,547	218,242
Government grant revenue	157,920	266,549	1,613,791
Total net revenue	165,804	272,096	1,832,033
Operating expenses
Selling, general, and administrative	982,521	1,262,790	51,567,733
Research and development	772,893	637,272	25,304,021
Restructuring expense		47,476	220,715
Loss on impairment of long-lived assets			390,970
Total operating expenses	1,755,414	1,947,538	77,483,439
Net operating loss	1,589,610	1,675,442	75,651,406
Interest expense	655,803	1,925,903	44,617,822
Loss on extinguishment of debt			250,097
Other (income) expense	(141)	(14,803)	(1,229,969)
Net loss	2,245,272	3,586,542	119,289,356
Preferred stock dividend	2,094,551		3,052,622
Net loss attributable to common stockholders	$ 4,339,523	$ 3,586,542	$ 122,341,978
Net loss per share, basic	$ (2.06)	$ (2.38)
Weighted average number of common shares outstanding, basic	2,102,771	1,509,361
Net loss per share, diluted	$ (3.36)	$ (4.30)
Weighted average number of common shares outstanding, diluted	2,210,251	1,618,106