Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended		557 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013
Statements Of Operations
Product Revenue	$ 24,685	$ 14,571	$ 60,079	$ 26,028	$ 623,016
Cost of sales	3,355	9,134	30,864	15,044	383,443
Net product revenue	21,330	5,437	29,215	10,984	239,573
Government grant revenue	34,377	509,435	192,297	775,984	1,648,168
Total net revenue	55,707	514,872	221,512	786,968	1,887,741
Operating expenses
Selling, general, and administrative	1,421,405	422,843	2,403,926	1,685,632	52,989,138
Research and development	748,565	604,574	1,521,458	1,241,846	26,052,586
Restructuring expense	0	170,298	0	217,774	220,715
Loss on impairment of long-lived assets	0	0	0	0	390,970
Total operating expenses	2,169,970	1,197,715	3,925,384	3,145,252	79,653,409
Net operating loss	2,114,263	682,843	3,703,872	2,358,284	77,765,668
Interest expense	1,416,856	867,524	2,072,660	2,793,427	46,034,679
Loss on extinguishment of debt	0	0	0	0	250,097
Other (income) expense	367	6,911	227	(7,892)	(1,229,601)
Net loss	3,531,486	1,557,278	5,776,759	5,143,819	122,820,843
Preferred stock dividend	2,551,789	0	4,645,340	0	5,603,411
Net loss attributable to common stockholders	$ 6,083,275	$ 1,557,278	$ 10,422,099	$ 5,143,819	$ 128,424,254
Net loss per share, basic	$ (1.23)	$ (0.97)	$ (2.94)	$ (3.30)
Weighted average number of common shares outstanding, basic	4,942,362	1,603,710	3,549,698	1,558,076
Net loss per share, diluted	$ (1.25)	$ (2.63)	$ (2.96)	$ (4.85)
Weighted average number of common shares outstanding, diluted	4,948,942	1,712,455	3,556,357	1,666,821