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Other Current Assets - Schedule of Other Current Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits	$ 60	$ 63
Other receivables	2	44
Prepaid insurance	124	93
Prepaid offering costs	275	144
Prepaid expenses- other	127	193
Other current assets	$ 588	$ 537

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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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