UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Operating activities:
Net loss	$ (3,548)	$ (2,232)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	808	552
Depreciation expense	56	50
Change in fair value of warrant liability	(155)	1,462
Changes in operating assets and liabilities:
Accounts receivable	400	(1,284)
Prepaid expenses, deposits and other	(73)	59
Accounts payable	347	(227)
Accrued liabilities	(196)	(270)
Deferred revenue	(427)	(254)
Net cash used in operating activities	(2,788)	(2,144)
Investing activities:
Purchase of property and equipment	(33)	(40)
Net cash used in investing activities	(33)	(40)
Financing activities:
Proceeds from financing activities	0	0
Net cash used in financing activities	0	0
Exchange rate effect on cash and cash equivalents	(18)	(12)
Decrease in cash and cash equivalents	(2,839)	(2,196)
Cash and cash equivalents, beginning of period	5,891	9,561
Cash and cash equivalents, end of period	$ 3,052	$ 7,365