UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Operating activities:
Net loss	$ (2,037,000)	$ (591,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,014,000	170,000
Depreciation expense	29,000	10,000
Change in fair value of warrant liability	(177,000)	0
Changes in operating assets and liabilities:
Accounts receivable	(651,000)	13,000
Grant receivable	13,000	0
Prepaid expenses, deposits and other	(65,000)	109,000
Accounts payable	(82,000)	165,000
Accrued liabilities	(38,000)	43,000
Deferred revenue	459,000	(355,000)
Net cash used in operating activities	(1,535,000)	(436,000)
Investing activities:
Purchase of property and equipment	(95,000)	(20,000)
Net cash used in investing activities	(95,000)	(20,000)
Financing activities:
Purchase of treasury stock	0	(31,000)
Proceeds from exercise of options and warrants	4,000	0
Net cash provided by (used in) financing activities	4,000	(31,000)
Exchange rate effect on cash and cash equivalents	8,000	3,000
Decrease in cash and cash equivalents	(1,618,000)	(484,000)
Cash and cash equivalents, beginning of period	10,457,000	2,572,000
Cash and cash equivalents, end of period	$ 8,839,000	$ 2,088,000