Balance Sheets (Unaudited) (USD $)	Jul. 31, 2014	Apr. 30, 2014
ASSETS
Cash and cash equivalents	$ 21,957,661	$ 58,320,555
Marketable securities	4,166,081	0
Accounts receivable	36,358	36,358
Government grant receivable	5,424	29,750
Prepaid expenses	273,579	401,964
Other current assets	216,834	177,406
Total current assets	26,655,937	58,966,033
Marketable securities	30,320,490	0
Property and equipment, net	102,594	124,374
Debt issuance costs, net	0	21,427
Intangible assets, net	22,998,133	22,999,744
Goodwill	11,265,100	11,265,100
Other assets	52,762	52,762
Total assets	91,395,016	93,429,440
Current liabilities
Accounts payable	585,914	411,145
Accrued liabilities	612,822	858,136
Warrant liabilities	680,680	954,876
Current portion of notes payable, net	16,007	346,890
Total current liabilities	1,895,423	2,571,047
Other liabilities	0	10,932
Deferred tax liability	7,962,100	7,962,100
Total liabilities	9,857,523	10,544,079
Stockholders' equity (deficit)
Preferred stock, undesignated, authorized 9,947,439 and 9,990,400 shares; respectively. See Note 8	0	0
Common stock, par value $.0001 per share; authorized 400,000,000 shares; issued and outstanding 28,107,264 and 27,858,000, respectively	2,811	2,786
Additional paid-in capital	220,357,577	219,468,498
Accumulated other comprehensive loss	(65,560)	0
Accumulated deficit	(138,757,335)	(136,585,923)
Total stockholders’ equity	81,537,493	82,885,361
Total liabilities and stockholders' equity	$ 91,395,016	$ 93,429,440