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Accounts Receivable, Unbilled Services and Deferred Revenue - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Receivables [Abstract]    
Accounts receivable $ 4,304 $ 2,655
Unbilled services 3,020 2,404
Total accounts receivable and unbilled services 7,324 5,059
Less: allowance for doubtful accounts (338) (289)
Total accounts receivable, net $ 6,986 $ 4,770