CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares shares in Thousands	Jan. 31, 2020	Apr. 30, 2019
Statement of Financial Position [Abstract]
Preferred stock par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	1,648	1,648
Preferred stock, shares outstanding	1,648	1,648
Common stock par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	56,479	56,136
Common stock, shares outstanding	56,479	56,136