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Account Receivable, Contract Assets, and Contract Liabilities (Tables)
3 Months Ended
Jul. 31, 2020
Account Receivable Contract Assets And Contract Liabilities  
Schedule of Accounts Receivable

The carrying value of such receivables represent their estimated realizable value. Accounts receivable consisted of the following at July 31, 2020 and April 30, 2020.

 

    July 31, 2020     April 30, 2020  
    (in thousands)  
             
Opening balance   $ 105     $ 63  
Amount invoiced to customers     21       1,386  
Collections     (105 )     (1,344 )
Ending balance   $ 21     $ 105