7. EQUITY COMPENSATION PLANS (Tables)

9 Months Ended

Jan. 31, 2019

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

Schedule of stock option activity

Stock Options	Shares			Weighted Average Exercisable Price
Outstanding, May 1, 2018		3,597,738		$	8.74
Granted		925,939		$	5.04
Exercised		(343,359	)	$	3.47
Canceled or expired		(878,820	)	$	11.53
Outstanding, January 31, 2019		3,301,498		$	7.51

Schedule of RSU activity

RSUs	Shares			Weighted Average Grant Date Fair Value
Outstanding, May 1, 2018		–		$	–
Granted		217,200			4.28
Vested		–			–
Forfeited		(10,950	)		3.62
Outstanding, January 31, 2019		206,250		$	4.31

Schedule of stock-based compensation expense

	Three Months Ended January 31,				Nine Months Ended January 31,
	2019		2018		2019		2018
Cost of contract manufacturing	$	147	$	139	$	317	$	277
Selling, general and administrative		311		259		763		589
Discontinued operations		–		14		–		340
Total	$	458	$	412	$	1,080	$	1,206
Share-based compensation from:
Stock options	$	385	$	374	$	914	$	1,070
RSUs		40		–		82		–
ESPP		33		38		84		136
Total	$	458	$	412	$	1,080	$	1,206