8. Stockholders’ Equity

Shelf Registration Statement

On November 2, 2018, the Company filed a universal shelf registration statement with the SEC for the issuance of common stock, preferred stock, warrants, rights, debt securities and units up to an aggregate amount of $100.0 million (the “2018 Shelf Registration Statement”). On November 14, 2018, the 2018 Shelf Registration Statement was declared effective by the SEC. In the future, the Company may periodically offer one or more of these securities in amounts, prices and terms to be announced when and if the securities are offered. At the time any of the securities covered by the 2018 Shelf Registration Statement are offered for sale, a prospectus supplement will be prepared and filed with the SEC containing specific information about the terms of any such offering.

Public Offerings

In February 2020, the Company completed a public offering of 17,250,000 shares of its common stock at a price of $3.00 per share. Proceeds from the public offering, net of underwriting discounts, commissions and offering expenses were approximately $48.4 million.

In August 2019, the Company completed a public offering of 14,526,315 shares of its common stock at a price of $0.95 per share. Proceeds from the public offering, net of underwriting discounts, commissions and offering expenses were approximately $12.7 million.

Private Placement

In March 2019, the Company completed a private placement of 8,426,750 shares of common stock at $0.93 per share. Proceeds from the Company’s private placement, net of offering costs were approximately $7.8 million.

ATM Sales Agreement

In January 2019, the Company entered into a common stock sales agreement (the “Sales Agreement”) under which the Company may sell up to an aggregate of $10.0 million in gross proceeds through the sale of shares of common stock from time to time in “at-the-market” equity offerings (as defined in Rule 415 promulgated under the Securities Act of 1933, as amended). The Company agreed to pay a commission of 3% of the gross proceeds of any common stock sold under the Sales Agreement. During the three months ended March 31, 2019, the Company issued and sold 665,974 shares of common stock under the Sales Agreement resulting in net proceeds to the Company of approximately $860. All such shares were sold during February and March 2019.

Stock-Based Compensation Expense

Stock-based compensation expense was allocated as follows:


	Three Months Ended
	March 31,
	2020		2019
Research and development	$	198	$	151
General and administrative		423		339
Total	$	621	$	490