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Accounts Receivable, Unbilled Services and Deferred Revenue (Tables)
 3 Months Ended
Jul. 31, 2022
Receivables [Abstract]  
Summary of accounts receivable, unbilled services, and advanced billings Accounts receivable and unbilled services were as follows (in thousands):
July 31, 2022April 30, 2022
Accounts receivable$5,619 $6,037 
Unbilled services4,366 4,106 
Total accounts receivable and unbilled services9,985 10,143 
Less allowance for doubtful accounts(630)(630)
Total accounts receivable, net$9,355 $9,513 
Summary of advanced billings Deferred revenue was as follows (in thousands):
July 31, 2022April 30, 2022
Deferred revenue$10,885 $11,071