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Operating Segments and Geographic Information (Tables)
12 Months Ended
Apr. 30, 2022
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

 

   Year Ended April 30, 2022 
  

North & South

America
   Europe  

Asia and

Australia
   Total 
   (in thousands) 
Revenues from external customers  $1,633   $19   $107   $1,759 
Net loss   (18,732)   (11)   (131)   (18,874)
Long-lived assets   445            445 
Total assets   73,359    19    15    73,393 

 

   Year Ended April 30, 2021 
   North & South
America
   Europe   Asia and
Australia
   Total 
   (in thousands) 
Revenues from external customers  $1,206   $   $   $1,206 
Net loss   (13,211)   (359)   (22)   (13,592)
Long-lived assets   406            406 
Total assets   86,085    19    273    86,377