Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Statements Of Operations
Product Revenue	$ 0	$ 35,394
Cost of sales	0	27,510
Net product revenue	0	7,884
Government grant revenue	0	157,920
Total net revenue	0	165,804
Operating expenses
Selling, general, and administrative	1,449,859	982,521
Research and development	966,514	772,893
Total operating expenses	2,416,373	1,755,414
Net operating loss	2,416,373	1,589,610
Interest expense	46,260	655,803
Other income	(291,221)	(141)
Net loss	2,171,412	2,245,272
Unrealized loss on marketable securities	65,560	0
Total comprehensive loss	2,236,972	4,339,823
Reconciliation of net loss to net loss attributable to common stockholders
Net loss	(2,171,412)	(2,245,272)
Preferred stock dividend	0	2,094,551
Net loss attributable to common stockholders	$ 2,171,412	$ 4,339,823
Net loss per share, basic	$ (0.08)	$ (2.06)
Weighted average number of common shares outstanding, basic	27,661,499	2,102,771
Net loss per share, diluted	$ (0.08)	$ (3.36)
Weighted average number of common shares outstanding, diluted	27,661,499	2,210,251