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Operating Segments and Geographic Information (Tables)
12 Months Ended
Apr. 30, 2020
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas
    Year Ended April 30, 2020  
    North America     Europe     Asia and Australia     Total  
    (in thousands)  
                         
Revenues from external customers   $ 1,682     $ -     $ -     $ 1,682  
Operating loss     (11,110 )     (234 )     (21 )     (11,365 )
Long-lived assets     499       -       -       499  
Total assets     13,251       36       251       13,538  

 

    Year Ended April 30, 2019  
    North America     Europe     Asia and Australia     Total  
    (in thousands)  
                         
Revenues from external customers   $ 632     $ -     $ -     $ 632  
Operating loss     (13,045 )     (204 )     (22 )     (13,271 )
Long-lived assets     592       -       -       592  
Total assets     18,028       49       289       18,366