SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Apr. 30, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes stock option activities for the Company’s option plans for the years ended April 30, 2017 and 2016:

							Weighted Average
							Remaining
			Weighted Average		Total Intrinsic		Contractual Life
	Number of Shares		Exercise Price		Value		(in years)
Outstanding as of May 1, 2015		40,688	$	18.8	$	-		5.9
Employee options granted		4,054,250		1.32		-		7.6
Forfeited/expired		(804,665)		1.37		-		-
Outstanding as of April 30, 2016		3,290,273		1.52		-		9.4
Employee options granted		1,017,000		1.35		-		9.3
Forfeited/expired		(979,136)		1.38		-		-
Outstanding as of April 30, 2017		3,328,137	$	1.51	$	108,655		8.7
Options vested and exercisable		2,928,137	$	1.53	$	108,655		8.5

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following assumptions were used to compute the fair value of stock options granted during the years ended April 30, 2017 and 2016:

	For the years ended
	April 30,
	2017			2016
Exercise price	$	1.35		$1.19 - $1.53
Expected term (years)		5.0		5.0
Expected stock price volatility		104.8	%	101.7% - 104.1	%
Risk-free rate of interest		1.8	%	1.3%-1.6	%

Schedule Of Common Stock Warrant Activity

The following is a summary of the common stock warrant activity for the years ended April 30, 2017 and 2016:

			Weighted		Weighted
			Average		Average
	Number of		Exercise		Remaining
	Warrants		Price		Life in years
Outstanding, May 1, 2015		15,510	$	7.25		3.3
Warrants issued in connection with Series H-1 preferred stock for cash		1,279,759		1.66		4.3
Outstanding as of April 30, 2016		1,295,269	$	5.50		4.2
Warrants issued in connection with Series H-2 preferred stock for cash		495,750		1.21		4.6
Warrants issued in connection with Series H-3 preferred stock for cash		1,101,751		1.38		4.9
Outstanding, April 30, 2017		2,892,770	$	3.23		4.1