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Accounts Receivable, Unbilled Services and Deferred Revenue - Summary of Accounts Receivable and Unbilled Services (Details) - USD ($) $ in Thousands | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
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Receivables [Abstract] |  |  |
Accounts receivable | $ 3,843 | $ 6,037 | $ 4,304
Unbilled services | 4,993 | 4,106 | 3,020
Total accounts receivable and unbilled services | 8,836 | 10,143 | 7,324
Less: allowance for doubtful accounts | (825) | (630) | (338)
Total accounts receivable, net | $ 8,011 | $ 9,513 | $ 6,986

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