Common Stock	3 Months Ended
Jul. 31, 2020
Equity [Abstract]
Common Stock	(11) Common Stock 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 million. Through July 31, 2020, under the 2019 ATM Facility the Company had sold and issued an aggregate of 5,913,362 shares of its common stock with an aggregate market value of $5.0 million at an average price of $0.85 per share and paid AGP a sales commission of approximately $162,448 related to those shares. On April 8, 2019, the Company sold 1,542,000 shares of common stock, which includes the sale of 642,000 shares of the Company’s common stock sold by the Company pursuant to the exercise, in full, of the over-allotment option by the underwriters in a public offering, prefunded warrants to purchase up to 3,385,680 shares of common stock and common warrants to purchase up to 4,927,680 shares of common stock in an underwritten public offering. The net proceeds to the Company from the offering were approximately $15.7 million, after deducting underwriter’s fees and offering expenses payable by the Company. On October 24, 2019, 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 is committed to purchase up to an aggregate of $10.0 million of shares of the Company’s common stock over a 30-month period that does not exceed 19.99% of the outstanding common stock on the date of the agreement. The number of shares the Company could issue within the 19.99% limit was 1,219,010 shares including the shares issued as a commitment fee. In consideration for entering into the agreement, the Company issued to Aspire Capital 194,805 shares of common stock as a commitment fee. Shareholder approval was needed for sale of common stock over the 19.99% limit of the outstanding common stock on the date of the agreement. At the 2019 annual meeting of stockholders, held on December 20, 2019, the Company’s stockholders approved an additional 5,400,000 shares to be issued pursuant to the common stock purchase agreement. Through July 31, 2020, the Company has 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.

Common Stock

3 Months Ended

Jul. 31, 2020

(11) Common Stock

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 million. Through July 31, 2020, under the 2019 ATM Facility the Company had sold and issued an aggregate of 5,913,362 shares of its common stock with an aggregate market value of $5.0 million at an average price of $0.85 per share and paid AGP a sales commission of approximately $162,448 related to those shares.

On April 8, 2019, the Company sold 1,542,000 shares of common stock, which includes the sale of 642,000 shares of the Company’s common stock sold by the Company pursuant to the exercise, in full, of the over-allotment option by the underwriters in a public offering, prefunded warrants to purchase up to 3,385,680 shares of common stock and common warrants to purchase up to 4,927,680 shares of common stock in an underwritten public offering. The net proceeds to the Company from the offering were approximately $15.7 million, after deducting underwriter’s fees and offering expenses payable by the Company.

On October 24, 2019, 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 is committed to purchase up to an aggregate of $10.0 million of shares of the Company’s common stock over a 30-month period that does not exceed 19.99% of the outstanding common stock on the date of the agreement. The number of shares the Company could issue within the 19.99% limit was 1,219,010 shares including the shares issued as a commitment fee. In consideration for entering into the agreement, the Company issued to Aspire Capital 194,805 shares of common stock as a commitment fee. Shareholder approval was needed for sale of common stock over the 19.99% limit of the outstanding common stock on the date of the agreement. At the 2019 annual meeting of stockholders, held on December 20, 2019, the Company’s stockholders approved an additional 5,400,000 shares to be issued pursuant to the common stock purchase agreement. Through July 31, 2020, the Company has 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.