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Operating Segments and Geographic Information (Tables)
 12 Months Ended
Apr. 30, 2023
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

 

   Year Ended April 30, 2023 
   North & South
America		   Europe   Asia and
Australia		   Total 
   (in thousands) 
Revenues from external customers  $2,479   $—   $253   $2,732 
Operating income (loss)   (26,375)   —    49    (26,326)
Right-of-use assets, net   

1,751

    —    —    1,751 
Long-lived assets   1,280    —    —    1,280 
Total assets   53,374    —    —    53,374 

 

   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 
Operating loss   (18,732)   (11)   (131)   (18,874)
Long-lived assets   445    —    —    445 
Total assets   73,359    19    15    73,393