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Accounts Receivable, Unbilled Services and Deferred Revenue - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Receivables [Abstract]    
Accounts receivable $ 2,655 $ 1,982
Unbilled services 2,404 2,417
Total accounts receivable and unbilled services 5,059 4,399
Less: allowance for doubtful accounts (289) (22)
Total accounts receivable, net $ 4,770 $ 4,377