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Other Current Assets (Tables)
 3 Months Ended
Jul. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Current Assets

Other current assets consist of the following at July 31, 2020 and April 30, 2020:

 

    July 31, 2020     April 30, 2020  
    (in thousands)  
             
Deposits   $ 9     $ 60  
Other receivables     2       2  
Prepaid insurance     143       124  
Prepaid offering costs     81       275  
Prepaid expenses- other     212       127  
    $ 447     $ 588