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Accounts Receivable, Unbilled Services and Deferred Revenue - Summary of Accounts Receivable and Unbilled Services (Details) - USD ($) $ in Thousands | Jul. 31, 2022 | Apr. 30, 2022
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Receivables [Abstract] |  |
Accounts receivable | $ 5,619 | $ 6,037
Unbilled services | 4,366 | 4,106
Total accounts receivable and unbilled services | 9,985 | 10,143
Less allowance for doubtful accounts | (630) | (630)
Total accounts receivable, net | $ 9,355 | $ 9,513

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