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Stock Options and Share-Based Compensation - Additional Information (Detail) - 2017 Plan - Restricted Stock Units (RSUs) - USD ($)	1 Months Ended		3 Months Ended
	May 31, 2020	Jun. 30, 2019	Jul. 31, 2020	Jul. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted (in shares)	12,045	83,816
Vesting period				3 years
Stock-based compensation expense			$ 59,000	$ 21,000
Remaining estimated compensation expense			$ 1,131,000	$ 696,000

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- Definition

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

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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