CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Operating activities:
Net loss	$ (10,445,537)	$ (13,139,820)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation and modification expense	2,599,000	3,162,000
Depreciation and amortization expense	156,000	214,000
Change in fair value of warrant liability	0	(981,000)
Modification of warrant liability	0	586,000
Gain/loss on sales of assets	0	5,000
Allowance for doubtful accounts	30,000	0
Changes in operating assets and liabilities:
Accounts receivable	(282,000)	265,000
Prepaid expenses, deposits and other	(97,000)	37,000
Restricted cash	13,000	2,000
Accounts payable	482,000	433,000
Accrued liabilities	(102,000)	(231,000)
Other Non-current liability	65,000	100,000
Deferred revenue	1,130,000	(82,000)
Net cash used in operating activities	(6,452,000)	(9,630,000)
Investing activities:
Purchase of property and equipment	(322,000)	(119,000)
Proceeds from sale of fixed assets	0	5,000
Net cash used in investing activities	(322,000)	(114,000)
Financing activities:
Private placement financing, net of financing costs of $880k	0	11,220,000
Proceeds from Executive Note financing	0	2,000,000
Payment of issuance costs related to 2015 Private Placement	(18,000)	0
Capital lease payments	(24,000)	(12,000)
Issuance of common stock	44,000	0
Proceeds from exercise of options and warrants	0	2,000
Net cash provided by financing activities	2,000	13,210,000
Increase (decrease) in cash and cash equivalents	(6,772,000)	3,466,000
Cash and cash equivalents, beginning of year	9,357,000	5,891,000
Cash and cash equivalents, end of year	2,585,000	9,357,000
Non-cash investing and financing activities:
Purchased equipment under capital lease	0	124,000
Conversion of executive note financing	0	2,000,000
Reclassification of warrant liability to equity	$ 0	$ 1,616,000