UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Operating activities:
Net loss	$ (3,051)	$ (5,461)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,664	1,523
Depreciation expense	87	76
Provision for bad debts	(2)	34
Issuance of common stock for services	15	0
Changes in operating assets and liabilities:
Accounts receivable	(577)	(865)
Prepaid expenses and other current assets	(3)	51
Restricted cash	0	13
Accounts payable	(744)	(76)
Accrued liabilities	31	(90)
Other non-current liability	20	35
Deferred revenue	5	(367)
Net cash used in operating activities	(2,555)	(5,127)
Investing activities:
Purchase of property and equipment	(30)	(44)
Net cash used in investing activities	(30)	(44)
Financing activities:
Payment of issuance costs related to March 2015 Private Placement	0	(18)
Capital lease payments	(12)	(11)
Net cash provided by/(used in) financing activities	4,328	(29)
Increase/(Decrease) in cash and cash equivalents.	1,743	(5,200)
Cash and cash equivalents, beginning of period	2,585	9,357
Cash and cash equivalents, end of period	4,328	4,157
June 2016 Public Offering [Member]
Financing activities:
Proceeds from June 2016 Public Offering, net of financing costs of $742	$ 4,340	$ 0