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Property and Equipment, net (Tables)
6 Months Ended
Oct. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Components of Property and Equipment

The components of property and equipment, net as of October 31, 2021 and April 30, 2021 consisted of the following:

 

   October 31, 2021   April 30, 2021 
   (in thousands) 
Equipment  $313   $291 
Computer equipment & software   501    498 
Office furniture & equipment   339    341 
Leasehold improvements   474    474 
Construction in process   15    15 
Property and equipment, gross    1,642    1,619 
Less: accumulated depreciation   (1,282)   (1,213)
Property and equipment, net   $360   $406