Stock-Based Compensation - Summary of Time-based Restricted Stock Units (Detail) - Time-Based Restricted Stock Units [Member] $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 31, 2022 USD ($) $ / shares shares
Senior Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units Vested | shares	19,786	[1]
Fair Value | $	$ 101	[1],[2]
Price Per Share | $ / shares	$ 5.10	[1],[3]
Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units Vested | shares	13,013	[4]
Fair Value | $	$ 66	[2],[4]
Price Per Share | $ / shares	$ 5.10	[3],[4]

[1] Time-based restricted stock units vested by senior executives.

[2] Dollar amounts are in thousands.

[3] Price per share is derived from the closing price of our common stock on the date the respective time-based restricted stock units vested.

[4] Time-based restricted stock units vested by key employees.