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Account Receivable, Contract Assets, and Contract Liabilities - Schedule of Accounts Receivable, Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Apr. 30, 2020
Account Receivable Contract Assets And Contract Liabilities
Accounts receivable		$ 105
Contract assets	63	251
Contract liabilities	$ 75	$ 100

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