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Account Receivable, Contract Assets, and Contract Liabilities - Schedule of Significant Changes in Contract assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Barclays Bank Agreement [Member]    
Transferred to receivables from contract assets recognized at the beginning of the period $ (251)  
Revenue recognized and not billed as of the end of the period 190 $ 251
Net change in contract assets (61) 236
Revenue recognized that was included in the contract liabilities balance as of the beginning of the period (159)  
Transferred to contract assets from contract liabilities recognized at the beginning of the period (6) (159)
Net change in contract liabilities $ (165) $ (23)