Stockholders' Equity

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Public Offering

In April 2020, we completed an underwritten public offering of common stock, generating gross proceeds of approximately $57.6 million and net proceeds of approximately $53.7 million through the issuance of 25,587,500 shares of common stock at an offering price of $2.25 per share.

Equity Purchase Agreement

We have had equity purchase agreements in place since 2011 with Aspire Capital Fund LLC (“Aspire Capital”) that provide us the ability to sell shares to Aspire Capital from time to time. Currently, we have an agreement with Aspire Capital that was entered into on November 5, 2019 and includes Aspire Capital’s commitment to purchase up to an aggregate of $100.0 million shares of our common stock over a defined timeframe. The terms of the 2019 equity facility are similar to the previous equity facilities with Aspire Capital, and we issued 350,000 shares of our common stock to Aspire Capital as a commitment fee in November 2019 and filed a registration statement for the resale of 31,000,000 shares of common stock in connection with the

equity facility. Our prior equity facility that was entered into in February 2018 was fully utilized and terminated during the first quarter of 2020.

There were no sales to Aspire Capital in the second quarter of 2020, and we sold 6,825,000 shares to Aspire Capital at an average price of $1.50 per share in the first quarter of 2020, generating proceeds of $10.2 million. We sold 3,350,000 shares to Aspire Capital at an average price of $1.52 per share in the second quarter of 2019, generating proceeds of $5.1 million and we sold 7,175,000 shares to Aspire Capital at an average price of $1.49 per share during the six months ended June 30, 2019, generating proceeds of $10.7 million.

Healios Warrant

In March 2020, Healios elected to exercise its warrant in full, and we issued 4,000,000 shares of our common stock at an exercise price equal to the reference price of $1.76 per share, as defined in the warrant. Proceeds of approximately $7.0 million were received in April 2020 in accordance with the terms of the warrant.

Healios Investor Rights Agreement

In March 2018, we entered into an investor rights agreement (the “Investor Rights Agreement”) with Healios that governs certain of our and Healios’ rights relating to Healios’ ownership of our common stock. Under the Investor Rights Agreement, Healios is permitted to participate in certain equity issuances as a means to maintain its proportionate ownership of our common stock as of the time of such issuance. In May 2020, we entered into a purchase agreement with Healios, providing for Healios to purchase shares of our common stock in connection with certain equity issuances to Aspire Capital. In May 2020, we sold Healios 310,526 shares of our common stock at $1.72 per share for an aggregate purchase price of $534,105, in accordance with the terms of the Investor Rights Agreement.