7. EQUITY COMPENSATION PLANS (Tables)

6 Months Ended

Oct. 31, 2016

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

Schedule of stock option transaction activity

Stock Options	Shares			Weighted Average Exercisable Price
Outstanding, May 1, 2016		23,751,261		$	1.48
Granted		6,856,384		$	0.49
Exercised		–			–
Canceled or expired		(933,116	)	$	1.14
Outstanding, October 31, 2016		29,674,529		$	1.26

Share-based compensation expense

	Three Months Ended October 31,				Six Months Ended October 31,
	2016		2015		2016		2015
Cost of contract manufacturing	$	24,000	$	9,000	$	66,000	$	22,000
Research and development		446,000		569,000		816,000		1,040,000
Selling, general and administrative		415,000		696,000		840,000		1,395,000
Total	$	885,000	$	1,274,000	$	1,722,000	$	2,457,000
Share-based compensation from:
Stock options	$	823,000	$	1,223,000	$	1,554,000	$	2,347,000
ESPP		62,000		51,000		168,000		110,000
	$	885,000	$	1,274,000	$	1,722,000	$	2,457,000