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Schedule of Stock Option Activity (Details) - $ / shares | 9 Months Ended
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Jan. 31, 2022
Stock Incentive Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares Underlying Options Outstanding, Beginning | 516,827
Weighted Average Exercise Price, Beginning Balance | $ 3.89
Weighted Average Remaining Contractual Term (In Years), Beginning | 9 years
Shares Underlying Options Outstanding, Granted | 793,850
Weighted Average Exercise Price, Granted | $ 1.43
Shares Underlying Options Outstanding, Exercised | (44,332)
Weighted Average Exercise Price, Exercised | $ 1.05
Shares Underlying Options Outstanding, Expired | (1,806)
Weighted Average Exercise Price, Expired | $ 32.62
Shares Underlying Options Outstanding, Cancelled/forfeited | (121,383)
Weighted Average Exercise Price, Cancelled/forfeited | $ 3.03
Shares Underlying Options Outstanding, Ending | 1,143,156
Weighted Average Exercise Price, Ending Balance | $ 2.34
Weighted Average Remaining Contractual Term (In Years), Ending | 9 years 4 months 24 days
Shares Underlying Options Outstanding, Exercisable at Ending | 308,481
Weighted Average Exercise Price, Exercisable at Ending | $ 4.59
Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending | 8 years 1 month 6 days
Performance Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares Underlying Options Outstanding, Beginning | 424,790
Weighted Average Exercise Price, Beginning Balance | $ 2.57
Weighted Average Remaining Contractual Term (In Years), Beginning | 9 years 6 months
Shares Underlying Options Outstanding, Granted | 66,667
Weighted Average Exercise Price, Granted | $ 0.62
Shares Underlying Options Outstanding, Exercised | (40,668)
Weighted Average Exercise Price, Exercised | $ 1.05
Shares Underlying Options Outstanding, Cancelled/forfeited | (220,766)
Weighted Average Exercise Price, Cancelled/forfeited | $ 2.58
Shares Underlying Options Outstanding, Ending | 230,023
Weighted Average Exercise Price, Ending Balance | $ 2.26
Weighted Average Remaining Contractual Term (In Years), Ending | 9 years 1 month 6 days
Shares Underlying Options Outstanding, Exercisable at Ending |
Weighted Average Remaining Contractual Term (In Years), Exercisable at Ending | 0 years

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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