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Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2021	Apr. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits	$ 126	$ 60
Other receivables	244	2
Prepaid insurance	411	124
Prepaid offering costs	56	275
Prepaid expenses- other	164	127
Other current assets	$ 1,001	$ 588

X

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Amount of asset related to consideration paid in advance for offering costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment within one year or during the operating cycle, if shorter.

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