CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Apr. 30, 2014	Apr. 30, 2013
Operating activities:
Net loss	$ (9,463)us-gaap_NetIncomeLoss	$ (5,134)us-gaap_NetIncomeLoss	$ (7,406)us-gaap_NetIncomeLoss	$ (6,330)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	2,807us-gaap_ShareBasedCompensation	2,376us-gaap_ShareBasedCompensation
Net foreign currency remeasurement loss			124	0
Depreciation expense	166us-gaap_DepreciationAndAmortization	158us-gaap_DepreciationAndAmortization	213us-gaap_DepreciationAndAmortization	203us-gaap_DepreciationAndAmortization
Change in fair value of warrant liability	(1,401)	1,202	965	74
Changes in operating assets and liabilities:
Accounts receivable	233	(2,623)	(825)	84
Grant receivable			0	0
Prepaid expenses, deposits and other	125	34	(68)	(110)
Restricted cash	2	28	27	(42)
Accounts payable	381	(266)	(223)	(472)
Accrued liabilities	(167)	94	(24)	(14)
Deferred revenue	218	981	977	(71)
Net cash used in operating activities	(7,622)	(3,558)	(3,433)	(4,302)
Investing activities:
Purchase of property and equipment	(84)	(164)	(234)	(57)
Net cash used in investing activities	(84)	(164)	(234)	(57)
Financing activities:
Proceeds from executive note financing	2,000us-gaap_ProceedsFromNotesPayable	0us-gaap_ProceedsFromNotesPayable
Capital lease payments	(5)	0
Proceeds from exercise of options and warrants	2	0	21	0
Net cash provided by financing activities	1,997	0	21	9,141
Private placement of commons shares and warrants			0	9,141
Exchange rate effect on cash and cash equivalents	0	(27)	(24)	25
Decrease in cash and cash equivalents	(5,709)	(3,749)	(3,670)	4,807
Cash and cash equivalents, beginning of period	5,891	9,561	9,561	4,754
Cash and cash equivalents, end of period	182	5,812	5,891	9,561
Non-cash investing activities:
Purchased equipment under capital lease	$ 124us-gaap_CapitalLeaseObligationsIncurred	$ 0us-gaap_CapitalLeaseObligationsIncurred

The (increase) decrease in amount due during the reporting period in Governmental, corporate, or foundation grants.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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