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Account Receivable and Contract Assets (Tables)
6 Months Ended
Oct. 31, 2021
Account Receivable And Contract Assets  
Schedule of Accounts Receivable, Contract Assets and Contract Liabilities

The following provides further details on the balance sheet accounts of accounts receivable and contract assets from contracts with customers:

 

   October 31, 2021   April 30, 2021 
   (in thousands) 
Accounts receivable  $180   $350 
Contract assets   325    190 
Contract liabilities  $117   $ 
Schedule of Significant Changes in Contract Assets and Contract Liabilities

Significant changes in the contract assets balances during the period were as follows:

 

   Six months ended
October 31, 2021
 
   (in thousands) 
Transferred to receivables from contract assets recognized at the beginning of the period  $(190)
Revenue recognized and not billed as of the end of the period   325 
Net change in contract assets  $135