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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
	Aug. 31, 2023	Jun. 30, 2023	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
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					$ 10	$ 41
2017 Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 241	$ 332	655	$ 658
Remaining estimated compensation expense			$ 1,550		$ 1,550
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)	0	87,220
Vesting period (in years)		3 years
Shares available for issuance (in shares)	64,633
2023 Plan \| Restricted Stock Units (RSUs) \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)	374,633
Increase in number of shares reserved for issuance (in shares)	310,000