Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net Loss	$ (19,541,839)	$ (9,415,800)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	150,489	148,804
Interest on debt instruments	2,181,955	4,236,332
Loss on impairment, disposal and write down of long-lived assets	2,519	35,673
Issuance and vesting of compensatory stock options and warrants	8,042,662	84,267
Issuance of common stock as compensation	651,460	185,264
Change in the fair value of warrants	721,840
Changes in operating assets and liabilities
Accounts receivable, prepaid expenses and other assets	519,255	(245,747)
Inventory	99,204	(20,228)
Accounts payable and accrued liabilities	(2,089,116)	70,152
Net cash used in operating activities	(9,261,571)	(4,921,283)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(9,804)	(17,199)
Proceeds from the sale of property and equipment		4,064
Capitalization of patent costs and license rights	(137,234)	(134,852)
Net cash used in investing activities	(147,038)	(147,987)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from sale of common stock and exercise of stock options and warrants, net of related expenses and payments	62,044,419
Repurchase of outstanding warrants		(380,000)
Proceeds from issuance of notes payable, net of issuance costs	141,320	102,671
Proceeds for issuance of convertible preferred stock, net of issuance costs	4,895,188	4,351,150
Payments on notes - short-term	(135,291)	(100,895)
Net cash provided by financing activities	66,945,636	3,972,926
Net change in cash and cash equivalents	57,537,027	(1,096,344)
Cash and cash equivalents, beginning of period	783,528	1,879,872
Cash and cash equivalents, end of period	58,320,555	783,528
Cash paid for:
Interest	30,328	2,123
Income taxes
Non-cash financing activities:
Restricted stock issued during period in payment of interest on convertible notes	220,041	745,208
Common stock issued for payment of dividends on Series C Convertible Preferred stock	1,300,204
Series D Convertible Preferred Stock issued as consideration for cancellation of $4.6 million in outstanding principal amount of a convertible promissory note issued by the Company on July 1, 2011	4,600,000
Common stock issued as payment for dividends on the Series D Convertible Preferred stock	$ 1,104,000