Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Stock Options and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Directors' fees paid with shares of common stock in lieu of cash in accordance with Director compensation guidelines				$ 41	$ 41
2017 Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 109	$ 129	433	$ 344
Remaining estimated compensation expense		$ 907		$ 907
2017 Plan \| Restricted Stock Units (RSUs) \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in shares)	5,500
Vesting period (in years)	2 years
2017 Plan \| Restricted Stock Units (RSUs) \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in shares)	51,471
Vesting period (in years)	3 years