5. Equity Compensation Plans (Tables)

9 Months Ended

Jan. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of stock option activity

	Stock Options			Grant Date Weighted Average Exercise Price
		(in thousands)
Outstanding at May 1, 2019		3,274		$	7.51
Granted		845		$	5.95
Exercised		(247	)	$	3.72
Canceled or expired		(931	)	$	10.45
Outstanding at January 31, 2020		2,941		$	6.45

Schedule of RSU activity

	Shares			Weighted Average Grant Date Fair Value
		(in thousands)
Outstanding at May 1, 2019		200		$	4.32
Granted		194		$	5.91
Vested		(49	)	$	4.30
Forfeited		(27	)	$	5.15
Outstanding at January 31, 2020		318		$	5.22

Share-based compensation expense

	Three Months Ended January 31,				Nine Months Ended January 31,
	2020		2019		2020		2019
Cost of revenues	$	248	$	147	$	679	$	317
Selling, general and administrative		347		311		1,170		763
Total stock-based compensation	$	595	$	458	$	1,849	$	1,080