7. NOTES PAYABLE (Details Narrative) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Less: Debt issuance costs			$ 251,000	$ 0
Net proceeds received from funding			14,749,000	0
Loss on extinguishment of debt	0	0	(1,696,000)	0
Loan Agreement
Initial funding, gross			15,000,000
Less: Debt issuance costs			251,000
Net proceeds received from funding			14,749,000
Repayment of Loan Agreement			15,000,000
Final payment fee			975,000
Warrants issued upon initial funding			273,280
Warrants issued upon initial funding price per share			$ 2.47
Fair value of warrants issued			470,000
Loss on extinguishment of debt			$ (1,696,000)