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Accounts Receivable, Unbilled Services and Deferred Revenue - Summary of Accounts Receivable and Unbilled Services (Details) - USD ($)
$ in Thousands
Jan. 31, 2022
Apr. 30, 2021
Receivables [Abstract]    
Accounts receivable $ 4,858 $ 4,304
Unbilled services 4,160 3,020
Total accounts receivable and unbilled services 9,018 7,324
Less allowance for doubtful accounts (455) (338)
Total accounts receivable, net $ 8,563 $ 6,986