8. EQUITY COMPENSATION PLANS (Tables)

6 Months Ended

Oct. 31, 2013

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, 2013		15,287,208		$	1.84
Granted		4,441,412		$	1.42
Exercised		(179,745	)	$	0.72
Canceled or expired		(1,097,187	)	$	4.99
Outstanding, October 31, 2013		18,451,688		$	1.56

Share-based compensation expense

	Three Months Ended October 31,				Six Months Ended October 31,
	2013		2012		2013		2012
Cost of contract manufacturing	$	16,000	$	9,000	$	40,000	$	18,000
Research and development		721,000		289,000		1,462,000		612,000
Selling, general and administrative		983,000		331,000		1,811,000		661,000
Total	$	1,720,000	$	629,000	$	3,313,000	$	1,291,000
Share-based compensation from:
Stock options	$	1,506,000	$	584,000	$	3,009,000	$	1,199,000
Restricted stock awards		139,000		–		139,000		–
Employee stock purchase plan		75,000		45,000		165,000		92,000
	$	1,720,000	$	629,000	$	3,313,000	$	1,291,000

Schedule of restricted stock activity

Restricted Stock	Shares			Weighted Average Grant Date Fair Value
Unvested, May 1, 2013		–		$	–
Granted		100,000		$	1.39
Vested		(100,000	)	$	1.39
Canceled or expired		–		$	–
Unvested, October 31, 2013		–		$	–