3. STOCKHOLDERS’ EQUITY

June 2020 Public Offering

On June 5, 2020, the Company issued and sold 14,601,628 shares of common stock, 2,789,700 pre-funded warrants exercisable for one share of our common stock at an exercise price of $0.00001 per share and 8,695,664 Series H warrants to purchase 8,695,664 shares of common stock. The public offering price of a share of common stock together with one-half of a Series H warrant to purchase one share of common stock was $1.15. The public offering price of a pre-funded warrant together with one-half of a Series H Warrant was $1.1499. The Series H warrants have an exercise price of $1.2075 per share and are exercisable for five years from the date of issuance. As of September 30, 2020, all 2,789,700 pre-funded warrants and 26,250 Series H warrants have been exercised.

In accordance with the concept of ASC 820 regarding the June 2020 public offering, the Company allocated value of the proceeds to the common stock and warrants utilizing a relative fair value basis. Using the Nasdaq closing trading price for our stock on June 5, 2020, the Company computed the fair value of the shares sold. The fair value of the warrants was estimated using the Black-Scholes option-pricing model at that same date. This valuation did not impact total Stockholders' Equity of $20.0 million, but is an internal proportionate calculation allocating the gross proceeds of approximately $12.1 million to common stock and $7.9 million to warrants.

Gross offering proceeds to the Company were $20.0 million, with net proceeds to the Company of approximately $18.3 million after deducting placement agent fees and related offering expenses. The Company intends to use the net proceeds from the offering for research and development, funding clinical studies, working capital and general corporate purposes.

The common stock, pre-funded warrants and Series H warrants were offered by the Company pursuant to a registration statement on Form S-1 filed on May 8, 2020 with the SEC under the Securities Act of 1933, as amended (the "Act") and an additional registration statement filed on June 2, 2020 pursuant to Rule 462(b) under the Act.

May 2019 Public Offering

On May 20, 2019, the Company issued and sold 1,982,000 shares of common stock at an offering price of $2.50 per share. In a concurrent private placement, the Company issued to the purchasers of our common stock, Series F warrants to purchase an aggregate of 1,982,000 shares of common stock. The Series F warrants were immediately exercisable, expire five years after the date of issuance, and have an exercise price of $2.40.

In a separate concurrent private placement transaction, the Company sold 2,018,000 shares of common stock together with Series G warrants to purchase an aggregate of up to 2,018,000 shares of common stock. The shares of common stock and Series G warrants were priced at $2.50 per fixed combination. The warrants sold in the private placement were immediately exercisable, expire five years after the date of issuance, and have an exercise price of $2.40.

In accordance with the concept of ASC 820 regarding the May 2019 public offering, the Company allocated value to the proceeds to the common stock and warrants utilizing a relative fair value basis. Using the Nasdaq closing trading price for our stock on May 20, 2019, the Company computed the fair value of the shares sold. The fair value of the warrants was estimated using the Black-Scholes option-pricing model at that same date. This valuation did not impact total Stockholders’ Equity of $10.0 million, but is an internal proportionate calculation allocating the gross proceeds of approximately $6 million to common stock and $4.0 million to warrants.

Gross offering proceeds to the Company were $10.0 million, with net proceeds to the Company of approximately $9.0 million after deducting placement agent fees and related offering expenses. The Company used the net proceeds from the offering for research and development, funding clinical studies, working capital and general corporate purposes.

The registered direct offering described above was made pursuant to a registration statement on Form S-3 previously filed with and subsequently declared effective by the SEC. The unregistered common shares and warrants were offered pursuant to the exemption from registration afforded by Section 4(a)(2) under the Act, and Regulation D promulgated thereunder. The offerings’ unregistered common shares and warrants were ultimately registered through our May 31, 2019 filing of Form S-1 and acceptance of this Registration Statement by the SEC.

Common Stock Warrants

The following table summarizes information with regard to outstanding warrants to purchase common stock as of September 30, 2020.