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Subsequent Events (Details Narrative) - USD ($)			6 Months Ended
	Dec. 07, 2020	Nov. 20, 2020	Oct. 31, 2020	Oct. 31, 2019	Apr. 30, 2020
Common stock, par value			$ 0.001		$ 0.001
Cash, cash equivalents, and restricted cash balances			$ 15,850,000		$ 10,930,000
Common stock sales			$ 3,241,000
Subsequent Event [Member] | Securities Exchange Commission [Member]
Aggregate offering price		$ 100,000,000
Subsequent Event [Member] | 2020 ATM Facility [Member]
Common stock, par value		$ 0.001
Subsequent Event [Member] | 2020 ATM Facility [Member] | AGP [Member]
Aggregate offering price		$ 50,000,000
Proceeds from issuance or sale of equity, net of issuance costs		$ 100,000,000
Subsequent Event [Member] | 2019 ATM Facility [Member]
Cash, cash equivalents, and restricted cash balances	$ 26,300,000
Common stock sales	$ 11,900,000

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- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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Face amount or stated value per share of common stock.

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The cash inflow from the additional capital contribution to the entity.

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