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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, 2020
Apr. 30, 2019
Revenues from external customers $ 1,682 $ 632
Operating loss (11,365) (13,271)
Long-lived assets 499 592
Total assets 13,538 18,366
North America [Member]    
Revenues from external customers 1,682 632
Operating loss (11,110) (13,045)
Long-lived assets 499 592
Total assets 13,251 18,028
Europe [Member]    
Revenues from external customers
Operating loss (234) (204)
Long-lived assets
Total assets 36 49
Asia and Australia [Member]    
Revenues from external customers
Operating loss (21) (22)
Long-lived assets
Total assets $ 251 $ 289