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Property and Equipment, net (Tables)
3 Months Ended
Jul. 31, 2022
Property, Plant and Equipment [Abstract]  
Schedule of Components of Property and Equipment

The components of property and equipment, net as of July 31, 2022 and April 30, 2022 consisted of the following:

           
   July 31, 2022   April 30, 2022 
   (in thousands) 
Equipment  $626   $615 
Computer equipment & software   590    571 
Office furniture & equipment   352    352 
Leasehold improvements   503    477 
Construction in process   15    15 
Property and equipment, gross   2,086    2,030 
Less: accumulated depreciation   (1,628)   (1,585)
Property and equipment, net  $458   $445