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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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