UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Operating activities:
Net loss	$ (2,546,449)	$ (2,913,101)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,129,000	775,000
Depreciation expense	45,000	37,000
Provision for bad debts	(2,000)	0
Issuance of common stock	15,000	0
Changes in operating assets and liabilities:
Accounts receivable	(314,000)	(398,000)
Prepaid expenses and other current assets	94,000	(20,000)
Restricted cash	0	13,000
Accounts payable	(387,000)	22,000
Accrued liabilities	(51,000)	43,000
Other non-current liability	20,000	0
Deferred revenue	(442,000)	(102,000)
Net cash used in operating activities	(2,439,000)	(2,543,000)
Investing activities:
Purchase of property and equipment	(17,000)	(29,000)
Net cash used in investing activities	(17,000)	(29,000)
Financing activities:
Payment of issuance costs related to March 2015 Private Placement	0	(18,000)
Capital lease payments	(6,000)	(7,000)
Net cash provided by/(used in) financing activities	4,334,000	(25,000)
Increase/(Decrease) in cash and cash equivalents.	1,878,000	(2,597,000)
Cash and cash equivalents, beginning of period	2,585,000	9,357,000
Cash and cash equivalents, end of period	4,463,000	6,760,000
June 2016 Public Offering [Member]
Financing activities:
Proceeds from June 2016 Public Offering, net of financing costs of $742	$ 4,340,000	$ 0