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Operating Segments and Geographic Information - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Revenues from external customers $ 1,206 $ 1,682
Operating loss (13,592) (11,365)
Long-lived assets 406 499
Total assets 86,377 13,538
North America [Member]    
Revenues from external customers 1,026 1,682
Operating loss (13,211) (11,110)
Long-lived assets 406 499
Total assets 86,085 13,251
Europe [Member]    
Revenues from external customers
Operating loss (359) (234)
Long-lived assets
Total assets 19 36
Asia and Australia [Member]    
Revenues from external customers
Operating loss (22) (21)
Long-lived assets
Total assets $ 273 $ 251