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Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jul. 31, 2021
Apr. 30, 2021
Accounting Policies [Abstract]    
Cash and Cash Equivalents $ 77,720 $ 83,028
Restricted cash- short term 384 384
Restricted cash- long term 222 222
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 78,326 $ 83,634