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Common Stock | 12 Months Ended
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Apr. 30, 2021
Equity [Abstract] |
Common Stock | (11) Common Stock As of April 30, 2021, the Company had 100,000,000 shares authorized with a par value of $0.001 per share and 52,458,011 shares issued. At the Market Offering Agreements On January 7, 2019, the Company entered into the 2019 ATM Facility with AGP, under which the Company may issue and sell to or through A.G.P./Alliance Global Partners, acting as agent and/or principal, shares of the Company’s common stock having an aggregate offering price of up to $25.0 million. From inception of the program through its termination on December 8, 2020, under the 2019 ATM Facility, the Company sold and issued an aggregate of 17,595,472 shares of its common stock with an aggregate market value of $23.4 million at an average price of $1.33 per share, including 12,342,506 shares in fiscal year 2021 with an aggregate market value of $18.7 million at an average price of $1.51 per share and paid AGP a sales commission of approximately $0.8 million related to those shares. The agreement was fully utilized and terminated on December 8, 2020. On November 20, 2020, the Company entered into an At the Market Offering Agreement with AGP (the “2020 ATM Facility”), having capacity up to $100.0 million. The Company on December 4, 2020 filed a prospectus with the Securities and Exchange Commission whereby, the Company could issue and sell to or through AGP, acting as agent and/or principal, shares of the Company’s common stock having an aggregate offering price of up to $50.0 million. From inception of the 2020 ATM Facility through January 31, 2021, the Company had sold and issued an aggregate of 17,179,883 shares of its common stock with an aggregate market value of $50.0 million at an average price of $2.91 per share and paid AGP a sales commission of approximately $1.6 million related to those shares. A prospectus supplement would need to be filed for the Company to sell additional amount under the 2020 ATM Facility. Equity Line Common Stock Purchase Agreements On October 24, 2019, the Company entered into a common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $10.0 million of shares of the Company’s common stock over a 30-month period. Through September 18, 2020, the Company had sold an aggregate of 6,424,205 shares of common stock with an aggregate market value of $4.0 million at an average price of $0.63 per share pursuant to this common stock purchase agreement, including 5,025,000 shares in fiscal year 2021 with an aggregate market value of $2.9 million at an average price of $0.57 per share. The agreement was fully utilized and terminated on September 18, 2020. On September 18, 2020, the Company entered into a new common stock purchase agreement with Aspire Capital which provided that, subject to certain terms, conditions and limitations, Aspire Capital was committed to purchase up to an aggregate of $12.5 million of shares of the Company’s common stock over a 30-month period subject to a limit of 19.99% of the outstanding common stock on the date of the agreement if the price did not exceed a specified price in the agreement. The number of shares the Company could issue within the 19.99% limit is 3,722,251 shares without shareholder approval. Shareholder approval was received at the Company’s annual meeting of stockholders on December 23, 2020 for the sale of 9,864,706 additional shares of common stock which exceeds the 19.99% limit of the outstanding common stock on the date of the agreement. Through January 31, 2021, the Company had sold an aggregate of 3,722,251 shares of common stock with an aggregate market value of $11.8 million at an average price of $3.17 per share pursuant to this common stock purchase agreement with approximately $1.0 million available as of April 30, 2021.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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