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Account Receivable, Contract Assets, and Contract Liabilities - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Account Receivable Contract Assets And Contract Liabilities
Opening balance	$ 63	$ 171
Amount invoiced to customer	1,386	857
Collections	(1,344)	(965)
Ending balance	$ 105	$ 63

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Cash receipts from customers during the current period which are usually for sales of goods and services.

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The cash inflow associated with the proceeds from sale and collection of receivables during the period.

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