SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Apr. 30, 2016

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, 2016 and 2015:

	Number of Shares		Weighted Average Exercise Price		Total Intrinsic Value		Weighted Average Remaining Contractual Life (in years)
Outstanding as of April 30, 2014		1,917	$	14.76	$	-		3.3
Employee options granted		46,363		20.06		-		5.1
Forfeited/expired		(7,592)		25.52		-		-
Outstanding as of April 30, 2015		40,688		18.79		-		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
Options vested and exercisable		2,475,386	$	1.58	$	-		9.4

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, 2016 and 2015:

	For the years ended
	April 30,
	2016		2015
Exercise price		$1.19 - $1.53		$4.84 - $26.40
Expected stock price volatility		101.7% - 104.1%		103.0% - 131.5%
Risk-free rate of interest		1.3%-1.6%		1.1% - 1.3%
Expected term (years)		5.0		5.0

Schedule Of Common Stock Warrant Activity

The following is a summary of the common stock warrant activity for the years ended April 30, 2016 and 2015: 

	Number of Warrants		Weighted Average Exercise Price		Weighted Average Remaining Life in years
Outstanding, April 30, 2014		171,582		72.27		3.0
Warrants exchanged in connection with the Amendment		(156,072)		47.39		-
Outstanding as of April 30, 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, April 30, 2016		1,295,269		1.73		4.2