CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Operating activities:
Net loss	$ (6,883,882)	$ (10,445,537)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation and modification expense	2,662,000	2,599,000
Depreciation and amortization expense	168,000	156,000
Allowance for doubtful accounts	24,000	30,000
Issuance of common stock for services	44,000	44,000
Changes in operating assets and liabilities:
Accounts receivable	(986,000)	(282,000)
Prepaid expenses and other current assets	143,000	(97,000)
Restricted cash	0	13,000
Other long term assets	(107,000)	0
Accounts payable	(43,000)	482,000
Accrued liabilities	412,000	(102,000)
Other non-current liabilities	(44,000)	65,000
Deferred revenue	1,771,000	1,130,000
Net cash used in operating activities	(2,840,000)	(6,408,000)
Investing activities:
Purchase of property and equipment	(766,000)	(322,000)
Net cash used in investing activities	(766,000)	(322,000)
Financing activities:
Proceeds from June 2016 public offering, net of financing costs of $742	4,340,000	0
Payment of issuance costs related to 2015 private placement	0	(18,000)
Capital lease payments	(24,000)	(24,000)
Net cash provided by (used in) financing activities	4,316,000	(42,000)
Increase (decrease) in cash and cash equivalents	710,000	(6,772,000)
Cash and cash equivalents, beginning of year	2,585,000	9,357,000
Cash and cash equivalents, end of year	$ 3,295,000	$ 2,585,000