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Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues from external customers $ 1,759 $ 1,206
Net loss (18,874) (14,760)
Total assets 73,393 86,377
Operating Segment [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues from external customers 1,759 1,206
Net loss (18,874) (13,592)
Long-lived assets 445 406
Total assets 73,393 86,377
North America [Member] | Operating Segment [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues from external customers 1,633 1,206
Net loss (18,732) (13,211)
Long-lived assets 445 406
Total assets 73,359 86,085
Europe [Member] | Operating Segment [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues from external customers 19
Net loss (11) (359)
Long-lived assets
Total assets 19 19
Asia and Australia [Member] | Operating Segment [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues from external customers 107
Net loss (131) (22)
Long-lived assets
Total assets $ 15 $ 273