UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
Jan. 31, 2015	Jan. 31, 2014
Operating activities:
Net loss	$ (9,463)us-gaap_NetIncomeLoss	$ (5,134)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,284us-gaap_ShareBasedCompensation	1,968us-gaap_ShareBasedCompensation
Depreciation expense	166us-gaap_DepreciationAndAmortization	158us-gaap_DepreciationAndAmortization
Change in fair value of warrant liability	(1,401)	1,202
Changes in operating assets and liabilities:
Accounts receivable	233	(2,623)
Prepaid expenses and other current assets	125	34
Restricted cash	2	28
Accounts payable	381	(266)
Accrued liabilities	(167)	94
Deferred revenue	218	981
Net cash used in operating activities	(7,622)	(3,558)
Investing activities:
Purchase of property and equipment	(84)	(164)
Net cash used in investing activities	(84)	(164)
Financing activities:
Proceeds from executive note financing	2,000us-gaap_ProceedsFromNotesPayable	0us-gaap_ProceedsFromNotesPayable
Capital lease payments	(5)	0
Proceeds from exercise of options	2	0
Net cash provided by financing activities	1,997	0
Exchange rate effect on cash and cash equivalents	0	(27)
Decrease in cash and cash equivalents	(5,709)	(3,749)
Cash and cash equivalents, beginning of period	5,891	9,561
Cash and cash equivalents, end of period	182	5,812
Non-cash investing activities:
Purchased equipment under capital lease	$ 124us-gaap_CapitalLeaseObligationsIncurred	$ 0us-gaap_CapitalLeaseObligationsIncurred

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