STOCKHOLDERS’ EQUITY

ATM Sales Agreement

In January 2018, the Company entered into a common stock sales agreement under which the Company may sell up to an aggregate of $10 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), including in sales made directly on the Nasdaq Capital Market, or Nasdaq, to or through a market maker or, subject to the Company's prior approval, in negotiated transactions. The Company agreed to pay a commission of up to 3% of the gross proceeds of any common stock sold under this agreement plus certain legal expenses. The common stock sales agreement was amended in August 2018 to refer to the Company’s shelf registration statement on Form S-3 (File No. 333-227019) that was filed to replace the Company’s shelf registration statement on Form S-3 (File No. 333-206396) that expired on August 28, 2018.

During the three months ended March 31, 2019, the Company issued and sold no shares under the common stock sales agreement. During the three months ended March 31, 2018, the Company generated gross proceeds of approximately $1.1 million and incurred issuance costs of $237,403 under this agreement on sales of an aggregate of 375,000 shares of the Company's common stock.

Underwritten Public Offering

In February 2018, the Company closed an underwritten public offering of 5.0 million shares of its common stock and warrants to purchase up to 3.5 million shares of its common stock. Each share of common stock was sold with a warrant to purchase up to 0.70 of a share of the Company’s common stock. The Company granted the underwriter a 30-day over-allotment option to purchase up to an additional 750,000 shares of common stock and/or warrants to purchase up to 525,000 shares of common stock. The underwriter exercised the option with respect to warrants to purchase 220,500 shares of common stock. The Company received gross proceeds of $10.3 million, including the proceeds from the sale of the warrants upon exercise of the underwriter’s over-allotment option, and net proceeds of approximately $9.4 million.

Common Stock Warrants

The warrants issued in the February 2018 underwritten offering have an exercise price of $3.00 per share and are exercisable immediately and for five years from issuance. The warrants include a price-based anti-dilution provision, which provides that, subject to certain limited exceptions, the exercise price of the warrants will be adjusted downward if the Company issues or sells (or is deemed to issue or sell) securities at a price that is less than the exercise price in effect immediately prior to such issuance or sale (or deemed issuance or sale). In that case, the exercise price of the warrants will be adjusted to equal the price at which the new securities are issued or sold (or are deemed to have been issued or sold). In addition, subject to certain exceptions, if the Company issues, sells or enters into any agreement to issue or sell securities at a price which varies or may vary with the market price of the shares of the Company’s common stock, the warrant holders have the right to substitute such variable price for the exercise price of the warrant then in effect. The warrants are exercisable only for cash, unless a registration statement covering the shares issued upon exercise of the warrants is not effective, in which case the warrants may be exercised on a cashless basis. A registration statement covering the shares issued upon exercise of the warrants is currently effective.

The exercise price of these warrants was automatically reduced to $0.98 per share in connection with the initial closing of the Company's underwritten public offering in April 2019. See Note 11, "Subsequent Events," herein.

The Company estimated the fair value of the warrants as of February 15, 2018 to be approximately $3.0 million which has been recorded in equity as of the grant date. The Company early adopted ASU 2017-11 and as a result has recorded the fair value of the warrants as equity (see Note 3).

No warrants were exercised during the three months ended March 31, 2019 or 2018. As of March 31, 2019, the Company had these warrants outstanding:



Shares Underlying Outstanding Warrants	Exercise Price		Expiration Date
2,906	$	120.40	December 1, 2021
3,737	$	120.40	December 6, 2021
17,190	$	60.50	January 8, 2020
6,500	$	10.00	April 4, 2026
3,720,500	$	3.00	February 15, 2023
3,750,833